Refactor faucet_event_client into python_lib

[anurag6]

Refactoring faucet_event_client into python_lib to allow multiple components other than daq(like device_coupler) to access it.

[codecov]

Codecov Report

Merging #938 (09cd971) into master (052db4b) will increase coverage by 0.07%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #938      +/-   ##
==========================================
+ Coverage   82.51%   82.59%   +0.07%     
==========================================
  Files          46       45       -1     
  Lines        5862     5693     -169     
==========================================
- Hits         4837     4702     -135     
+ Misses       1025      991      -34     

Flag	Coverage Δ
ata	62.80% <50.00%> (+0.17%)	⬆️
aux	67.82% <50.00%> (-0.43%)	⬇️
base	65.99% <50.00%> (-0.48%)	⬇️
dhcp	67.12% <50.00%> (-0.38%)	⬇️
many	66.82% <50.00%> (-0.39%)	⬇️
mud	71.80% <50.00%> (-0.35%)	⬇️
switch	67.35% <50.00%> (-0.44%)	⬇️
topo	66.23% <50.00%> (-0.28%)	⬇️
unit	32.88% <25.00%> (+0.40%)	⬆️

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Impacted Files	Coverage Δ
daq/forchestrator.py	0.00% <0.00%> (ø)
daq/runner.py	85.44% <100.00%> (-0.11%)	⬇️
daq/traffic_analyzer.py	86.50% <0.00%> (-3.18%)	⬇️
daq/topology.py	95.85% <0.00%> (-0.16%)	⬇️
python_lib/faucet_event_client.py
daq/host.py	91.35% <0.00%> (+0.28%)	⬆️
daq/tcpdump_helper.py	80.95% <0.00%> (+2.38%)	⬆️
daq/stream_monitor.py	90.08% <0.00%> (+2.47%)	⬆️
daq/varz_state_collector.py	50.60% <0.00%> (+3.61%)	⬆️

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