Az implementation

[Sploder12]

This PR adds implementations for making VMs unavailable and available. Also has unavailable VMs ignore commands that change anything related to that VM. There are a few known race conditions that are outside the scope of AZs to fix.

MULTI-1789 MULTI-1941

[codecov[bot]]

Codecov Report

:x: Patch coverage is 60.00000% with 22 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 89.54%. Comparing base (acba722) to head (ac617b5).

Files with missing lines	Patch %	Lines
src/daemon/daemon.cpp	41.17%	10 Missing :warning:
...latform/backends/shared/base_availability_zone.cpp	33.33%	10 Missing :warning:
...rc/platform/backends/qemu/qemu_virtual_machine.cpp	50.00%	1 Missing :warning:
.../platform/backends/shared/base_virtual_machine.cpp	95.23%	1 Missing :warning:

Additional details and impacted files

@@                  Coverage Diff                   @@
##           availability-zones    #4061      +/-   ##
======================================================
+ Coverage               89.24%   89.54%   +0.30%     
======================================================
  Files                     246      246              
  Lines                   15756    14309    -1447     
======================================================
- Hits                    14061    12813    -1248     
+ Misses                   1695     1496     -199     

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