Improve test coverage for glanceclient shells

Registered by Tatyanka

OpenStack glanceclient shells modules includes a lot of components not covered with unit tests.

Add unittests for the following modules:
* glanceclient.shell
* glanceclient.v1.shell
* glanceclient.v1.legacy_shell
* glanceclient.v2.shell

Blueprint information

Status:
Started
Approver:
None
Priority:
Medium
Drafter:
None
Direction:
Approved
Assignee:
Tatyanka
Definition:
Approved
Series goal:
None
Implementation:
Good progress
Milestone target:
None
Started by
Mark Washenberger

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