Add support of "ui" config option

[legal90]

Doc: https://www.consul.io/docs/agent/options.html#_ui
This option has been introduced in Consul 0.6.1: https://github.com/hashicorp/consul/blob/master/CHANGELOG.md#061-january-6-2016

[codecov-io]

Current coverage is 68.48%

Merging #261 into master will increase coverage by +19.85% as of 690068c

@@            master    #261   diff @@
======================================
  Files            6       6       
  Stmts          329     330     +1
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit            160     226    +66
  Partial          0       0       
+ Missed         169     104    -65

Review entire Coverage Diff as of 690068c

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[lock]

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