[RFE] Provide a --retire option in lieu of --rm-host

[sadsfae]

(This was originally @kambiz-aghaiepour suggestion, filing for him here)

Occasionally we might decommission systems instead of outright removing them from QUADS control and it might be useful to preserve the scheduling history and/or the interfaces or other data so it can be referenced later.

Some option like quads-cli --retire --host host01.example.com would help here, where it might:

• tag a retired: yes flag onto the hosts mongodb collection
• any host with retired: yes would not be schedulable or show up in the following returns:
  • not show up in --ls-hosts unless something like --retired-hosts is passed
  • not show up on wiki / visuals
  • not show up in any totals relying on --ls-hosts
  • not show up in --ls-available

If another approach involving CloudHistory is possible here perhaps that's ok too.

[grafuls]

Functionality is the same as for --mark-broken: https://review.gerrithub.io/c/redhat-performance/quads/+/505587

[grafuls]

https://review.gerrithub.io/c/redhat-performance/quads/+/516088