Rename RootSet to CommitSet

Rename RootSet to CommitSet
https://bugs.webkit.org/show_bug.cgi?id=169580

Rubber-stamped by Chris Dumez.

Renamed root_sets to commit_sets and roots to commit_set_relationships in the database schema, and renamed
related classes in public/v3/ and tools accordingly.

RootSet, MeasurementRootSet, and CustomRootSet are respectively renamed to CommitSet, MeasurementCommitSet,
and CustomCommitSet.

In order to migrate the database, run:
```
BEGIN;
ALTER TABLE root_sets RENAME TO commit_sets;
ALTER TABLE commit_sets RENAME COLUMN rootset_id TO commitset_id;
ALTER TABLE roots RENAME TO commit_set_relationships;
ALTER TABLE commit_set_relationships RENAME COLUMN root_set TO commitset_set;
ALTER TABLE commit_set_relationships RENAME COLUMN root_commit TO commitset_commit;
ALTER TABLE build_requests RENAME COLUMN request_root_set TO request_commit_set;
END;
```

* browser-tests/index.html:
* init-database.sql:
* public/api/build-requests.php:
(main):
* public/api/test-groups.php:
(main):
(format_test_group):
* public/include/build-requests-fetcher.php:
(BuildRequestsFetcher::__construct):
(BuildRequestsFetcher::results_internal):
(BuildRequestsFetcher::commit_sets): Renamed from root_sets.
(BuildRequestsFetcher::commits): Renamed from roots.
(BuildRequestsFetcher::fetch_commits_for_set_if_needed): Renamed from fetch_roots_for_set_if_needed.
* public/privileged-api/create-test-group.php:
(main):
(ensure_commit_sets): Renamed from commit_sets_from_root_sets.
* public/v3/components/analysis-results-viewer.js:
(AnalysisResultsViewer.prototype.buildRowGroups):
(AnalysisResultsViewer.prototype._collectCommitSetsInTestGroups): Renamed from _collectRootSetsInTestGroups.
(AnalysisResultsViewer.prototype._buildRowsForPointsAndTestGroups):
(AnalysisResultsViewer.prototype._buildRowsForPointsAndTestGroups):
(AnalysisResultsViewer.CommitSetInTestGroup): Renamed from RootSetInTestGroup.
(AnalysisResultsViewer.CommitSetInTestGroup.prototype.constructor):
(AnalysisResultsViewer.CommitSetInTestGroup.prototype.commitSet): Renamed from rootSet.
(AnalysisResultsViewer.CommitSetInTestGroup.prototype.succeedingCommitSet): Renamed from succeedingRootSet.
(AnalysisResultsViewer.TestGroupStackingBlock.prototype.constructor):
(AnalysisResultsViewer.TestGroupStackingBlock.prototype.addRowIndex):
(AnalysisResultsViewer.TestGroupStackingBlock.prototype.isComplete):
(AnalysisResultsViewer.TestGroupStackingBlock.prototype.startRowIndex):
(AnalysisResultsViewer.TestGroupStackingBlock.prototype.endRowIndex):
(AnalysisResultsViewer.TestGroupStackingBlock.prototype._computeTestGroupStatus):
* public/v3/components/chart-revision-range.js:
(ChartRevisionRange.prototype._revisionForPoint):
(ChartRevisionRange.prototype._computeRevisionList):
* public/v3/components/customizable-test-group-form.js:
(CustomizableTestGroupForm.prototype.constructor):
(CustomizableTestGroupForm.prototype.setCommitSetMap): Renamed from setRootSetMap.
(CustomizableTestGroupForm.prototype._submitted):
(CustomizableTestGroupForm.prototype._computeCommitSetMap): Renamed from _computeRootSetMap.
(CustomizableTestGroupForm.prototype.render): Renamed from render.
(CustomizableTestGroupForm.prototype._constructRevisionRadioButtons):
* public/v3/components/results-table.js:
(ResultsTable.prototype.render):
(ResultsTable.prototype._createRevisionListCells):
(ResultsTable.prototype._computeRepositoryList):
(ResultsTableRow.prototype.constructor):
(ResultsTableRow.prototype.commitSet): Renamed from rootSet.
* public/v3/components/test-group-results-table.js:
(TestGroupResultsTable.prototype.buildRowGroups):
* public/v3/index.html:
* public/v3/models/build-request.js:
(BuildRequest.prototype.constructor):
(BuildRequest.prototype.updateSingleton):
(BuildRequest.prototype.commitSet): Renamed from rootSet.
(BuildRequest.constructBuildRequestsFromData):
* public/v3/models/commit-set.js: Renamed from public/v3/models/root-set.js.
(CommitSet): Renamed from RootSet.
(CommitSet.containsMultipleCommitsForRepository):
(MeasurementCommitSet): Renamed from MeasurementRootSet.
(MeasurementCommitSet.prototype.namedStaticMap):
(MeasurementCommitSet.prototype.ensureNamedStaticMap):
(MeasurementCommitSet.namedStaticMap):
(MeasurementCommitSet.ensureNamedStaticMap):
(MeasurementCommitSet.ensureSingleton):
(CustomCommitSet): Renamed from CustomRootSet.
* public/v3/models/measurement-adaptor.js:
(MeasurementAdaptor.prototype.applyTo):
* public/v3/models/test-group.js:
(TestGroup.prototype.constructor):
(TestGroup.prototype.addBuildRequest):
(TestGroup.prototype.repetitionCount):
(TestGroup.prototype.requestedCommitSets): Renamed from requestedRootSets.
(TestGroup.prototype.requestsForCommitSet): Renamed from requestsForRootSet.
(TestGroup.prototype.labelForCommitSet): Renamed from labelForRootSet.
(TestGroup.prototype.didSetResult):
(TestGroup.prototype.compareTestResults):
(TestGroup.prototype._valuesForCommitSet): Renamed from _valuesForRootSet.
(TestGroup.prototype.createAndRefetchTestGroups):
* public/v3/pages/analysis-task-page.js:
(AnalysisTaskPage.prototype.render):
(AnalysisTaskPage.prototype._retryCurrentTestGroup):
(AnalysisTaskPage.prototype._createNewTestGroupFromChart):
(AnalysisTaskPage.prototype._createNewTestGroupFromViewer):
(AnalysisTaskPage.prototype._createTestGroupAfterVerifyingCommitSetList):
* server-tests/api-build-requests-tests.js:
* server-tests/resources/mock-data.js:
(MockData.resetV3Models):
(MockData.addMockData):
(MockData.addAnotherMockTestGroup):
* tools/detect-changes.js:
(createAnalysisTaskAndNotify):
* tools/js/buildbot-syncer.js:
(BuildbotSyncer.prototype._propertiesForBuildRequest):
(BuildbotSyncer.prototype._revisionSetFromCommitSetWithExclusionList):
* tools/js/database.js:
(tableToPrefixMap):
* tools/js/v3-models.js:
* tools/sync-buildbot.js:
(syncLoop):
* tools/sync-with-buildbot.py: Deleted. No longer used.
* unit-tests/analysis-task-tests.js:
* unit-tests/build-request-tests.js:
(sampleBuildRequestData):
* unit-tests/buildbot-syncer-tests.js:
(sampleCommitSetData):
* unit-tests/measurement-adaptor-tests.js:
* unit-tests/measurement-set-tests.js:
* unit-tests/resources/mock-v3-models.js:
(MockModels.inject):
* unit-tests/test-groups-tests.js:
(sampleTestGroup):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@213952 268f45cc-cd09-0410-ab3c-d52691b4dbfc