ENH: Add rule to remove downtime

[lizsalmon]

Description:

This PR:

• Adds values to the enum in hypervisor_states.py to add states for all possible machines. REBOOTED, EMPTY, DOWN
• Adds in a rule to remove the downtime on a hypervisor being "patched and rebooted" only once it is back up (in rebooted state)

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Submitter:

Have you (where applicable):

• Added unit tests?
• Checked the latest commit runs on Dev?
• Updated the example config file(s) and README?

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Reviewer

Does this PR:

• Place non-StackStorm code into the lib directory?
• Have unit tests for the action/sensor and lib layers?
• Have clear and obvious action parameter names and descriptions?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.15%. Comparing base (5c66bae) to head (0a23b1c).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #297   +/-   ##
=======================================
  Coverage   98.14%   98.15%           
=======================================
  Files         126      126           
  Lines        4575     4599   +24     
  Branches      242      244    +2     
=======================================
+ Hits         4490     4514   +24     
  Misses         76       76           
  Partials        9        9           

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