Remove GlVboPerfTest tests from known failures.

testVboVsNonVboPerfGeometry0 and
testVboVsNonVboPerfGeometry1 pass as expected.

Move testVboWithVaryingIndexBufferNumbers to a separate bug
because it is a different failure.

bug:17394321
Change-Id: Ie64c38bbbd279fc5c2fa74e515789db34adeaed9