Adding support for s390x platform

[Megha-Rajanna]

Hi team,
I am from the IBM Z (s390x) porting team. I would like to open a PR for s390x support for pravega zookeeper.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.91%. Comparing base (a9b059d) to head (ca25188).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #616   +/-   ##
=======================================
  Coverage   85.91%   85.91%           
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  Files          12       12           
  Lines        1633     1633           
=======================================
  Hits         1403     1403           
  Misses        145      145           
  Partials       85       85           

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