BUG: Skip VMs booted from volumes

[DavidFair]

VMs which boot from volume do not have an image ID directly associated. Skip these as a hot-fix, later on we can walk through the volume to get the image ID

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.24% 🎉

Comparison is base (a54746d) 96.52% compared to head (f99b8e5) 96.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   96.52%   96.76%   +0.24%     
==========================================
  Files          16       16              
  Lines        1036     1052      +16     
==========================================
+ Hits         1000     1018      +18     
+ Misses         36       34       -2     

Flag	Coverage Δ
rabbit_consumer	96.76% <100.00%> (+0.24%)	⬆️

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Files Changed	Coverage Δ
...abbit-Consumer/rabbit_consumer/message_consumer.py	94.20% <100.00%> (+0.12%)	⬆️
...k-Rabbit-Consumer/rabbit_consumer/openstack_api.py	87.50% <100.00%> (+4.89%)	⬆️
...tack-Rabbit-Consumer/test/test_message_consumer.py	100.00% <100.00%> (ø)
...enStack-Rabbit-Consumer/test/test_openstack_api.py	100.00% <100.00%> (ø)

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