Take advantage of LMDB append optimization

[jnwatson]

No description provided.

[codecov]

Codecov Report

Merging #1912 into master will decrease coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1912      +/-   ##
==========================================
- Coverage   96.68%   96.54%   -0.15%     
==========================================
  Files         139      139              
  Lines       26505    26508       +3     
==========================================
- Hits        25626    25591      -35     
- Misses        879      917      +38     

Flag	Coverage Δ
#linux	96.54% <100.00%> (-0.15%)	⬇️
#linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/lmdbslab.py	99.59% <100.00%> (+0.20%)	⬆️
synapse/lib/slabseqn.py	87.80% <100.00%> (+0.20%)	⬆️
synapse/tests/utils.py	93.56% <0.00%> (-2.20%)	⬇️
synapse/cortex.py	95.19% <0.00%> (-0.82%)	⬇️
synapse/lib/hiveauth.py	95.96% <0.00%> (-0.77%)	⬇️
synapse/lib/view.py	95.29% <0.00%> (-0.75%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/lib/layer.py	97.80% <0.00%> (-0.07%)	⬇️

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