Implement checksum image index property in the python-glanceclient
Change-Id: If1426b7938457014ef27a86d3902d53854161627
Implements: blueprint index-using-checksum-image-property
Added the CLI option image-tag-update to associate a tag to an image via API V2.
Added the CLI option image-tag-delete to delete a tag associated with an image via API V2.
Related to bp glance-client-v2
Change-Id: I76060e1982223770a6c2c0bd9376d568af0df456
Add unittests for the following modules:
* glanceclient.shell
* glanceclient.v1.shell
* glanceclient.v1.legacy_shell
* glanceclient.v2.shell
Also add mock library to the tools/test-requires
Implements: blueprint glanceclient-shells-unittests
Change-Id: I5ec527c5efff3726932d234d7c67e08149643f89