Bug - mirror prov.done is incorrect (SYN-4275, SYN-4246)

[vEpiphyte]

Ensure we always write the prov.done file to the iden which we used to do provisioning when we boot from a mirror.

[codecov]

Codecov Report

Base: 97.18% // Head: 97.08% // Decreases project coverage by -0.10% ⚠️

Coverage data is based on head (9b45006) compared to base (f25ca69).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 9b45006 differs from pull request most recent head c61bc37. Consider uploading reports for the commit c61bc37 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2882      +/-   ##
==========================================
- Coverage   97.18%   97.08%   -0.11%     
==========================================
  Files         215      215              
  Lines       41958    41947      -11     
==========================================
- Hits        40776    40723      -53     
- Misses       1182     1224      +42     

Flag	Coverage Δ
linux	97.08% <100.00%> (-0.01%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/lib/cell.py	98.13% <100.00%> (+<0.01%)	⬆️
synapse/tests/utils.py	94.41% <100.00%> (-1.83%)	⬇️
synapse/cortex.py	96.71% <0.00%> (-0.54%)	⬇️
synapse/lib/hiveauth.py	96.01% <0.00%> (-0.48%)	⬇️
synapse/lib/trigger.py	94.98% <0.00%> (-0.39%)	⬇️
synapse/lib/view.py	97.00% <0.00%> (-0.34%)	⬇️
synapse/cmds/cron.py	97.56% <0.00%> (-0.25%)	⬇️
synapse/lib/jsonstor.py	98.30% <0.00%> (-0.25%)	⬇️
synapse/axon.py	98.73% <0.00%> (-0.15%)	⬇️
... and 11 more

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