Add the support of the failover config

[uds5501]

Introduce Config driven failover constants

Fixes : #108

[codecov-commenter]

Codecov Report

Merging #111 (93cf61e) into unstable (ae8fadf) will increase coverage by 0.36%. Report is 2 commits behind head on unstable. The diff coverage is 100.00%.

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@@             Coverage Diff              @@
##           unstable     #111      +/-   ##
============================================
+ Coverage     25.69%   26.05%   +0.36%     
============================================
  Files            31       31              
  Lines          2608     2621      +13     
============================================
+ Hits            670      683      +13     
  Misses         1845     1845              
  Partials         93       93              

Flag	Coverage Δ
unittests	26.05% <100.00%> (+0.36%)	:arrow_up:

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Files Changed	Coverage Δ
config/config.go	85.45% <100.00%> (ø)
server/server.go	20.00% <100.00%> (ø)

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[git-hulk]

@uds5501 Thanks for your contribution.