fix enabling docker cli experimental features in travis env

[bwagner5]

Issue #, if available:
N/A

Description of changes:
Turning on experimental docker cli would not work if the docker config did not already exist.

• Generate minimal docker config if one does not exist
• Remove perl to switch on experimental and instead use jq

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #159 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #159   +/-   ##
=======================================
  Coverage   94.63%   94.63%           
=======================================
  Files           8        8           
  Lines         634      634           
=======================================
  Hits          600      600           
  Misses         22       22           
  Partials       12       12           

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[jaypipes]

Good stuff, thanks @bwagner5 :)