find nic_name automatically if misspecified

[arberzela]

Added functionality to catch exceptions when the network card name is misspecified or is None. This may be useful in cluster environments with several submission nodes in cases when the network interfaces are different among them and the login node

[codecov-io]

Codecov Report

Merging #29 into development will decrease coverage by 0.39%. The diff coverage is 0%.

@@              Coverage Diff               @@
##           development      #29     +/-   ##
==============================================
- Coverage        40.67%   40.27%   -0.4%     
==============================================
  Files               40       40             
  Lines             2611     2622     +11     
==============================================
- Hits              1062     1056      -6     
- Misses            1549     1566     +17

Impacted Files	Coverage Δ
hpbandster/utils.py	0% <0%> (ø)	:arrow_up:
hpbandster/core/master.py	91.66% <0%> (-2.5%)	:arrow_down:
hpbandster/core/dispatcher.py	85.04% <0%> (-1.41%)	:arrow_down:

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[sfalkner]

Hey Arber, thanks for contributing. I think your functionality is very useful, but I don't think trying to guess the NIC should be the default behavior. Why don't you add a function guess_host that does what your code already does (maybe in a more portable way, maybe the socket module has the functionality to get the route to a given target). Best, Stefan