Create / delete named VM snapshot

[ddemlow]

As a user I would like to be able to take and delete a named VM snapshot via ansible.

I may for example want to take snapshots before applying VM changes either at hypercore level or inside VM - such as applying updates - and then later delete snapshot after confirming such operation was successful

(See also issue 10 - which would allow cloning from specific named snapshots #10)

[ddemlow]

probably also need way to list snapshots and get info ... so may want vm_snaphot and vm_snapshot_info modules? (SE team made request for snapshot info and count for reporting as well)

[justinc1]

Implemented in

• Vm snapshot #217
• Snapshot cloning #219
• Adding vm_snapshot examples to collection #223
• Add shutdown destination VM functionallity before attaching a disk from a source snapshot. #233