Rename autotest WMGC to graphics_Sanity.

We don't have a window manager to test anymore, but the test still
catches issues. This renames graphics_WindowManagerGraphicsCapture
to graphics_Sanity to reflect this.

Also minor changes to appease the upload script.

BUG=chromium-os:30493
TEST=Runs locally on Daisy.

Change-Id: I5346436d78326d81635b3aa5b3e75d72c2be28bb
Reviewed-on: https://gerrit.chromium.org/gerrit/42665
Commit-Queue: Ilja H. Friedel <ihf@chromium.org>
Reviewed-by: Ilja H. Friedel <ihf@chromium.org>
Tested-by: Ilja H. Friedel <ihf@chromium.org>
6 files changed