Make BaseV2MemeberImageTest inherits from BaseV2ImageTest

Without this patch BaseV2MemeberImageTest inherits from BaseImageTest
which permits all tests using BaseV2MemeberImageTest to run even if
glance API v2 is not supported

Change-Id: Ibe350204098aa1a37db1ed45269d6b087a8dde4a
Closes-Bug: #1269815
1 file changed