Feat user group mgmt

[sgherdao]

Hi Joe,

I have added the cml users and cml groups commands (with tests and docs). Also added some minor cleanups and improvements (isort, doc, .gitignore).

No rush to merge, feel free to play with it and I can adapt based on suggestions.

Tx

[coveralls]

Pull Request Test Coverage Report for Build 9621711667

Details

• 372 of 396 (93.94%) changed or added relevant lines in 67 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.9%) to 75.835%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
virl/cli/groups/ls/commands.py	19	20	95.0%
virl/cli/users/ls/commands.py	19	20	95.0%
virl/cli/views/groups/group_views.py	20	22	90.91%
virl/cli/views/users/user_views.py	22	24	91.67%
virl/cli/groups/delete/commands.py	18	21	85.71%
virl/cli/groups/update/commands.py	29	32	90.63%
virl/cli/users/create/commands.py	24	30	80.0%
virl/cli/users/update/commands.py	30	36	83.33%

Totals
Change from base Build 8772541850:	1.9%
Covered Lines:	1952
Relevant Lines:	2574

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💛 - Coveralls