Bug 866567. Mask layers for client container layers. r=mattwoodrow
No bug - Remove <link rel="help" href=...> from reference files since W3C test suite importer doesn't like it.  r=me, DONTBUILD
Bug 857127 - Clean up health report logging after test finishes; r=rnewman

This was producing periodic output in the test harness, confusing
automation into thinking the test was still actively running.