Remove BaseV*ImageAdminTest class

This commit removes BaseV1 and V2 ImageAdminTest classes. The usage
was removed in the previous commit[0]. So, we don't need to have these
class anymore.

[0] I9ccf070a12d24e63db5fb0f960c8be764b1b02dd

Change-Id: Ie99bf856000c596ddc797be6ac09d4f0fd6a9256
1 file changed