consul_config: Add "node_id" option

[legal90]

Fixes #418

node_id option is available in Consul 0.7.3+

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@08e704a). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #420   +/-   ##
=========================================
  Coverage          ?   58.38%           
=========================================
  Files             ?        7           
  Lines             ?      346           
  Branches          ?        0           
=========================================
  Hits              ?      202           
  Misses            ?      144           
  Partials          ?        0

Impacted Files	Coverage Δ
libraries/consul_config.rb	77.5% <100%> (ø)

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