Add additional info about errored machines for openstack provider

[gnuoy]

No description provided.

[codecov]

Codecov Report

Merging #499 (b1e5c8a) into master (d5f57e5) will decrease coverage by 0.27%.
The diff coverage is 26.31%.

@@            Coverage Diff             @@
##           master     #499      +/-   ##
==========================================
- Coverage   89.00%   88.72%   -0.28%     
==========================================
  Files          44       44              
  Lines        4428     4445      +17     
==========================================
+ Hits         3941     3944       +3     
- Misses        487      501      +14     

Impacted Files	Coverage Δ
zaza/utilities/openstack_provider.py	39.17% <6.66%> (-5.95%)	⬇️
zaza/charm_lifecycle/destroy.py	88.00% <100.00%> (+1.04%)	⬆️

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