Add nameserver config option in pps2018-runner

[TAlonglong]

• [ ] Closes #xxxx
• [ ] Tests added
• [ ] Tests passed: Passes pytest nwcsafpps_runner
• [ ] Passes flake8 nwcsafpps_runner
• [ ] Fully documented

The nameserver needs to be specified in the Publisher when your nameserver runs without multicast

[codecov[bot]]

Codecov Report

Merging #31 (5c78ce2) into main (7550fd0) will increase coverage by 0.41%. The diff coverage is 73.52%.

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   53.53%   53.94%   +0.41%     
==========================================
  Files          14       14              
  Lines        1741     1774      +33     
  Branches      209      213       +4     
==========================================
+ Hits          932      957      +25     
- Misses        792      799       +7     
- Partials       17       18       +1     

Flag	Coverage Δ
unittests	53.94% <73.52%> (+0.41%)	:arrow_up:

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Impacted Files	Coverage Δ
nwcsafpps_runner/publish_and_listen.py	0.00% <0.00%> (ø)
nwcsafpps_runner/l1c_processing.py	64.15% <33.33%> (-0.90%)	:arrow_down:
nwcsafpps_runner/tests/test_level1c_runner.py	99.37% <100.00%> (+0.10%)	:arrow_up:

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