update sanity data for gpu::cvtColor
update sanity data for gpu::cvtColor
Merge pull request #54 from jet47:gpu-cvtcolor-fix
Merge branch '2.4'

(ignoring their changes, since an equivalent pull request for master is
coming up)

Conflicts:
	testdata/perf/gpu.xml
Merge pull request #55 from jet47:gpu-cvtcolor-fix-master