Increase robustness of openstack port delete

[codecov[bot]]

Codecov Report

Merging #245 into master will decrease coverage by 24.52%. The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master     #245       +/-   ##
===========================================
- Coverage   79.98%   55.45%   -24.53%     
===========================================
  Files          35       35               
  Lines        8288     8289        +1     
  Branches      904      905        +1     
===========================================
- Hits         6629     4597     -2032     
- Misses       1348     3580     +2232     
+ Partials      311      112      -199     

Impacted Files	Coverage Δ
cloudbridge/providers/openstack/services.py	44.70% <0.00%> (+0.07%)	:arrow_up:
cloudbridge/providers/azure/helpers.py	13.04% <0.00%> (-69.57%)	:arrow_down:
cloudbridge/providers/gcp/helpers.py	26.08% <0.00%> (-59.79%)	:arrow_down:
cloudbridge/providers/azure/azure_client.py	34.77% <0.00%> (-56.12%)	:arrow_down:
cloudbridge/providers/azure/services.py	30.51% <0.00%> (-56.06%)	:arrow_down:
cloudbridge/providers/gcp/resources.py	29.83% <0.00%> (-50.53%)	:arrow_down:
cloudbridge/providers/azure/resources.py	38.37% <0.00%> (-50.38%)	:arrow_down:
cloudbridge/providers/gcp/services.py	39.36% <0.00%> (-44.03%)	:arrow_down:
cloudbridge/providers/azure/provider.py	55.22% <0.00%> (-34.33%)	:arrow_down:
cloudbridge/providers/azure/subservices.py	77.27% <0.00%> (-22.73%)	:arrow_down:
... and 12 more

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