Feature synnodes stability

[vEpiphyte]

Originally in #1451 from dev_unstable branch.

• Make the syn.nodes ingest bulletproof

[codecov]

Codecov Report

Merging #1511 into master will increase coverage by 11.19%.
The diff coverage is 81.25%.

@@             Coverage Diff             @@
##           master    #1511       +/-   ##
===========================================
+ Coverage   84.35%   95.54%   +11.19%     
===========================================
  Files         134      134               
  Lines       21627    21638       +11     
===========================================
+ Hits        18243    20674     +2431     
+ Misses       3384      964     -2420

Flag	Coverage Δ
#linux	95.54% <81.25%> (+11.19%)	⬆️

Impacted Files	Coverage Δ
synapse/lib/stormtypes.py	97.35% <100%> (+1.99%)	⬆️
synapse/lib/storm.py	95.51% <80%> (+10.55%)	⬆️
synapse/lib/spawn.py	97.89% <0%> (-0.85%)	⬇️
synapse/lib/agenda.py	91.82% <0%> (+0.23%)	⬆️
synapse/lib/hive.py	97.43% <0%> (+0.36%)	⬆️
synapse/lib/lmdbslab.py	98.91% <0%> (+0.54%)	⬆️
synapse/lib/base.py	92.38% <0%> (+0.66%)	⬆️
synapse/common.py	94.2% <0%> (+1.08%)	⬆️
synapse/lib/cli.py	90.29% <0%> (+1.11%)	⬆️
synapse/cryotank.py	92.44% <0%> (+1.16%)	⬆️
... and 39 more

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