Fix unrelated errors in ASTC negative API tests

Make cube map width and height equal while the keeping the size multiple
of the block size.

Generate texture names and bind before calling glTexStorage.

Allow INVALID_ENUM and INVALID_VALUE for glTexStorage failures.

Some minor log message improvements.

Bug: 21953041
Change-Id: I5180810bbaa0275b55d89e795e0132a17e32ef04
1 file changed