[YUNIKORN-1992] Use standard .gz extension for compressed configmap entries

[craigcondit]

What is this PR for?

Use .gz instead of .gzip as an extension on configmap entries to match standard naming conventions.

What type of PR is it?

• - Bug Fix
• - Improvement
• - Feature
• - Documentation
• - Hot Fix
• - Refactoring

Todos

• - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-1992

How should this be tested?

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[codecov]

Codecov Report

Merging #681 (7ae687f) into master (3df6f52) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #681   +/-   ##
=======================================
  Coverage   71.83%   71.83%           
=======================================
  Files          51       51           
  Lines        8116     8116           
=======================================
  Hits         5830     5830           
  Misses       2086     2086           
  Partials      200      200           

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