This adds support in the python API and Trove CLI
for instance module commands. These commands include:
- module-apply
- module-remove
- module-query
- module-retrieve
- module-list-instance
The parsing of --instance was modified to allow multiple
modules to be specified. This was extended to 'nics' as well.
Partially Implements: blueprint module-management
Change-Id: If62f5e51d4628cc6a8b10303d5c3893b3bd5057e