Remove skips for fixed bugs.

This commit removes skips from tests for bugs that have been fixed.
This currently unskips:

 - volume.admin.test_volume_types_extra_specs_negative:test_update_no_body
 - compute.images.test_images_oneserver:test_create_image_specify_name_over_256_chars

Also, the volume_types_client was updated to enable test_update_no_body
running. The extra_specs update method previously couldn't handle the
blank input from the negative test.

Change-Id: If13125bf5c0635b6190f1385e88d234db7a4156e
3 files changed