This migrates the above files from tempest. This includes tempest commits:
* images_client.py: I57818ccf8d0f6a631223a240b20829e5c40c3e6d
* test_images_client.py: I2a33e98c6b6770ef6e67362a663847296e03fbc1
* images.py: Ica929c402a3d042ae751302384e68853eb28b405
to see the commit history for these files refer to the above Change-Ids
in the tempest repository.
Partially implements blueprint migrate-service-clients-to-tempest-lib
Change-Id: I495915a5a40f7d351cb69463c032281e02c907c7