syncIndexEvents, yield more often, make unit test less picky

[jnwatson]

No description provided.

[codecov]

Codecov Report

Merging #2025 (bca89d8) into master (bf81234) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2025      +/-   ##
==========================================
- Coverage   96.75%   96.61%   -0.14%     
==========================================
  Files         148      148              
  Lines       29084    29084              
==========================================
- Hits        28140    28100      -40     
- Misses        944      984      +40     

Flag	Coverage Δ
linux	96.61% <100.00%> (-0.14%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/layer.py	98.24% <100.00%> (-0.07%)	⬇️
synapse/tests/utils.py	93.66% <0.00%> (-2.16%)	⬇️
synapse/cortex.py	95.75% <0.00%> (-0.76%)	⬇️
synapse/lib/hiveauth.py	96.05% <0.00%> (-0.76%)	⬇️
synapse/lib/view.py	94.19% <0.00%> (-0.70%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/lib/lmdbslab.py	99.60% <0.00%> (+0.19%)	⬆️

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