Reduce concurrent use of websocket for web3 node providers

[derekpierre]

• [x] Relock dependencies
  • There is an issue with influxdb 5.3.0 and msgpack that we are avoiding for now (https://github.com/influxdata/influxdb-python/pull/818). When influxdb 5.3.1 becomes available we should switch to it.
• [x] Reduce calls to contracts eg. get_current_period() instead using epoch to determine current period
• [x] Some sort of staggered start to looping tasks to prevent issue with overloading underlying websocket

  • File "/Users/derek/.local/share/virtualenvs/nucypher-monitor-3hnjUmmD/lib/python3.7/site-packages/websockets/protocol.py", line 474, in recv
    "cannot call recv while another coroutine "
        builtins.RuntimeError: cannot call recv while another coroutine is already waiting for the next message

[derekpierre]

@KPrasch FYI encountered the python_version thing in the requirements.txt/dev-requirements.txt files when relocking deps.

[codecov-commenter]

Codecov Report

Merging #73 into master will increase coverage by 0.21%. The diff coverage is 43.33%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   47.65%   47.87%   +0.21%     
==========================================
  Files          10       10              
  Lines         959      963       +4     
==========================================
+ Hits          457      461       +4     
  Misses        502      502              

Impacted Files	Coverage Δ
monitor/dashboard.py	19.84% <0.00%> (ø)
monitor/crawler.py	46.91% <46.42%> (+0.52%)	:arrow_up:

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