Test some corner cases of loop analysis.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Test that a layered fbo can have attachments with different layer counts.
Revert "framework: Add support for a test timeout"

This reverts commit ab2eb660925e3680e868c5f469a4ef32e6dd9a59.

Conflicts:
	framework/status.py
WIP: loop analysis tests
WIP: test clear color with mismatched layer count
Swappy swap