Remove sudo for Travis CI

[micw523]

Looks like we're doing release right now - I'm sending this PR in.

This is the same PR as kubernetes-client/python#896.

[micw523]

/assign @roycaihw @yliaog

[codecov-io]

Codecov Report

Merging #148 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   93.44%   93.44%           
=======================================
  Files          13       13           
  Lines        1374     1374           
=======================================
  Hits         1284     1284           
  Misses         90       90

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[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: micw523, yliaog

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