Add fields to NetworkIF to help determine physical interfaces

[dbwiddis]

Fixes #976

[coveralls]

Coverage decreased (-0.09%) to 86.135% when pulling 4873bc5 on dbwiddis:physnet into 650336d on oshi:master.

[codecov]

Codecov Report

Merging #1150 into master will decrease coverage by 0.04%.
The diff coverage is 76.92%.

@@             Coverage Diff              @@
##             master    #1150      +/-   ##
============================================
- Coverage     81.53%   81.48%   -0.05%     
- Complexity        0      447     +447     
============================================
  Files            27       27              
  Lines          1278     1291      +13     
  Branches        165      165              
============================================
+ Hits           1042     1052      +10     
- Misses          154      157       +3     
  Partials         82       82

Impacted Files	Coverage Δ	Complexity Δ
...hi-core/src/main/java/oshi/hardware/NetworkIF.java	87.03% <76.92%> (-1.39%)	43 <6> (+43)

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