Remove redundant srvs shuffle

[0xkookoo]

We have servers shuffle in github.com/samuel/go-zookeeper/conn.go:191 and github.com/samuel/go-zookeeper/dnshostprovider.go:53, so one of them should be removed. The shuffle logic is more proper to keep inside the real connect component, that's why I choose to remove the outside one.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.98%. Comparing base (3ac3132) to head (a6fb885).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
- Coverage   77.08%   76.98%   -0.10%     
==========================================
  Files           7        7              
  Lines        1322     1321       -1     
==========================================
- Hits         1019     1017       -2     
  Misses        212      212              
- Partials       91       92       +1     

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[jeffbean]

this change would be a breaking behavioral change for clients that provide their own hostprovider that does not shuffle before Init. I also would not want to keep the shuffle in the conn.go as you are correct in that the ordering should be totally handled in the hostprovider.

This would need to be cleaned up in a v2.

Closing PR, tracked the change intent in #131