Added retry WAN parameters

[gdavison]

Added retry_join_wan and retry_interval_wan so that WAN addresses can be set at start up

[codecov-io]

Current coverage is 48.94%

Merging #267 into master will increase coverage by +0.27% as of a15801d

@@            master    #267   diff @@
======================================
  Files            7       7       
  Stmts          378     380     +2
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit            184     186     +2
  Partial          0       0       
  Missed         194     194       

Review entire Coverage Diff as of a15801d

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[lock]

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