implement pop() and cull() on multiqueue/slabseqn

[invisig0th]

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[codecov]

Codecov Report

Merging #2032 (ebee340) into master (cdf69ce) will decrease coverage by 0.15%.
The diff coverage is 97.22%.

@@            Coverage Diff             @@
##           master    #2032      +/-   ##
==========================================
- Coverage   96.77%   96.62%   -0.16%     
==========================================
  Files         148      148              
  Lines       29125    29153      +28     
==========================================
- Hits        28185    28168      -17     
- Misses        940      985      +45     

Flag	Coverage Δ
linux	96.62% <97.22%> (-0.16%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/stormtypes.py	97.79% <90.00%> (-0.05%)	⬇️
synapse/cortex.py	95.76% <100.00%> (-0.76%)	⬇️
synapse/lib/lmdbslab.py	99.41% <100.00%> (-0.20%)	⬇️
synapse/lib/slabseqn.py	89.36% <100.00%> (+1.55%)	⬆️
synapse/tests/utils.py	93.66% <0.00%> (-2.16%)	⬇️
synapse/lib/hiveauth.py	96.05% <0.00%> (-0.76%)	⬇️
synapse/lib/view.py	94.22% <0.00%> (-0.70%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
... and 1 more

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