Support for start_join_wan

[justintime]

Starting with Consul 0.5.0, upstream added a start_join_wan option: https://www.consul.io/docs/agent/options.html#start_join_wan

[codecov-io]

Current coverage is 48.91%

Merging #224 into master will decrease coverage by -6.36% as of 4051e5e

@@            master    #224   diff @@
======================================
  Files            6       6       
  Stmts          322     323     +1
  Branches         0       0       
  Methods          0       0       
======================================
- Hit            178     158    -20
  Partial          0       0       
- Missed         144     165    +21

Review entire Coverage Diff as of 4051e5e

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[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.