Remove CacheFile cache from APC on write

If APC is enabled on the piwik server, cache files written by the CacheFile
class are stored in the opcode cache. This causes disk io problems when doing
things like loading weblogs into piwik with the import_logs.py script,
especially when running in --disable-bulk-tracking mode. In this scenario,
apache write IO quickly reaches 100% and slows the import to a crawl.
Only use localhost in HttpTest test.
refs  #6311 Do not run autoconf and see if travis works again
Temporarily disable test cc @diosmosis
green screenshot tests build
Fix HttpTest w/ localhost change.
Update UI tests submodule for formless login UI test.
xhprof: Execute aclocal and autoconf only if Gentoo is used.
Refactor Login controller and auth to be more modular and easier to extend/override. Added extra method to Auth interface and documented Auth interface completely. Created new PasswordResetter class to contain password reset logic.
Use superuser access when changing user password in PasswordResetter.
Fixing Login UI Tests.
Require autoload in cli-script-bootstrap.php so geoipUpdateRows.php script will work.
Fix AccessTest integration test.
Merge pull request #6320 from sabl0r/gentoo2

xhprof: Execute aclocal and autoconf only if Gentoo is used.
Merge pull request #6315 from brownoxford/delete-cachefile-from-apc-on-write

Remove CacheFile cache from APC on write
Add breaking change for Auth interface changes.
Refactor Auth::initSession method into its own class (SessionInitializer) since the logic will be common to all authentication implementations. Includes tweak to docs of UsersManager API method and additional methods to Auth interface.
Fixing AccessTest.
Revert UsersManager API change since it breaks BC for API users of getTokenAuth.
Fixing LoginTest.