Fix flaky aux ci test after enhanced nmap test

[noursaidi]

Fix flaky aux ci test after enhanced nmap test (PR #935 ) merged into master.

The enhanced nmap test results in slightly longer AUX test times. As the CI test duration is somewhat variable, on some runs the faux devices makes one additional DHCP request, resulting in a test fail.

This resolve that by upping the DHCP request threshold from 5 to 6

Example successful CI: https://github.com/faucetsdn/daq/runs/4537256530?check_suite_focus=true
Example failure CI: https://github.com/faucetsdn/daq/runs/4559129359?check_suite_focus=true

[codecov]

Codecov Report

Merging #939 (59eba79) into master (e9e851a) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #939      +/-   ##
==========================================
+ Coverage   82.56%   82.63%   +0.06%     
==========================================
  Files          46       46              
  Lines        5862     5862              
==========================================
+ Hits         4840     4844       +4     
+ Misses       1022     1018       -4     

Flag	Coverage Δ
ata	63.86% <ø> (+1.23%)	⬆️
aux	68.21% <ø> (-0.04%)	⬇️
base	66.30% <ø> (-0.23%)	⬇️
dhcp	67.50% <ø> (ø)
many	67.20% <ø> (-0.35%)	⬇️
mud	72.03% <ø> (-0.16%)	⬇️
switch	67.77% <ø> (-0.02%)	⬇️
topo	66.44% <ø> (-0.07%)	⬇️
unit	32.48% <ø> (ø)

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Impacted Files	Coverage Δ
daq/traffic_analyzer.py	86.50% <0.00%> (-3.18%)	⬇️
daq/acl_state_collector.py	80.82% <0.00%> (-2.74%)	⬇️
daq/runner.py	85.75% <0.00%> (+0.20%)	⬆️
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%)	⬆️

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