Added support for alternative zookeeper path roots.

[jonbonazza]

@timoha this is the replacement PR for #21. It contains the fix you mentioned in there as well.

[codecov-io]

Codecov Report

Merging #32 into master will increase coverage by 0.34%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   35.91%   36.25%   +0.34%     
==========================================
  Files          19       19              
  Lines        1693     1688       -5     
==========================================
+ Hits          608      612       +4     
+ Misses       1037     1029       -8     
+ Partials       48       47       -1

Impacted Files	Coverage Δ
rpc.go	68.62% <100%> (ø)	✅
client.go	53.2% <20%> (+2.61%)	✅

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