Master branch updates

[chapulina]

Part of gazebo-tooling/release-tools#416

Summary

Update all usage of master

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #672 (54e44bf) into ign-gazebo3 (7d98df4) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           ign-gazebo3     #672   +/-   ##
============================================
  Coverage        77.88%   77.88%           
============================================
  Files              210      210           
  Lines            11649    11649           
============================================
  Hits              9073     9073           
  Misses            2576     2576           

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