Check cortex/layer idens prior to migration

[mikemoritz]

• Also makes minimum cortex version a hard requirement

[codecov]

Codecov Report

Merging #1788 into master will decrease coverage by 0.04%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master    #1788      +/-   ##
==========================================
- Coverage   96.16%   96.12%   -0.05%     
==========================================
  Files         139      139              
  Lines       26560    26577      +17     
==========================================
+ Hits        25541    25546       +5     
- Misses       1019     1031      +12     

Flag	Coverage Δ
#linux	96.12% <92.85%> (-0.05%)	⬇️
#linux_replay	66.00% <0.00%> (-0.19%)	⬇️

Impacted Files	Coverage Δ
synapse/tools/migrate_200.py	97.60% <92.85%> (-0.21%)	⬇️
synapse/lib/spawn.py	95.48% <0.00%> (-1.94%)	⬇️
synapse/lib/base.py	92.55% <0.00%> (-0.60%)	⬇️
synapse/lib/agenda.py	94.11% <0.00%> (-0.23%)	⬇️

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