Add wait/timeout support to cryotank slice (SYN-3776)

[mikemoritz]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.10% ⚠️

Comparison is base (ea8e7fe) 97.29% compared to head (b5a1351) 97.19%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3320      +/-   ##
==========================================
- Coverage   97.29%   97.19%   -0.10%     
==========================================
  Files         228      228              
  Lines       45939    45943       +4     
==========================================
- Hits        44697    44655      -42     
- Misses       1242     1288      +46     

Flag	Coverage Δ
linux	97.19% <100.00%> (+<0.01%)	⬆️
linux_replay	?

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Files Changed	Coverage Δ
synapse/cryotank.py	92.69% <100.00%> (+0.12%)	⬆️
synapse/lib/stormlib/imap.py	100.00% <100.00%> (ø)

... and 9 files with indirect coverage changes

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