NRWT's HTTP servers should support additional directories for resources

NRWT's HTTP servers should support additional directories for resources
https://bugs.webkit.org/show_bug.cgi?id=78528

Reviewed by Eric Seidel.

This functionality will be used by the Chromium-Android port.

* Scripts/webkitpy/layout_tests/port/base.py:
(Port.to.start_http_server):
* Scripts/webkitpy/layout_tests/servers/apache_http_server.py:
(LayoutTestApacheHttpd.__init__):
* Scripts/webkitpy/layout_tests/servers/http_server.py:
(Lighttpd.__init__):
(Lighttpd._prepare_config):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@107614 268f45cc-cd09-0410-ab3c-d52691b4dbfc