Expose the ability to stop a server

[nkoenig]

Signed-off-by: Nate Koenig [email protected]

🎉 New feature

Summary

Exposes ServerPrivate::Stop through a new Server::Stop function. This is useful when using Gazebo as a library.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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 and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1551 (38ab456) into ign-gazebo6 (6739800) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           ign-gazebo6    #1551   +/-   ##
============================================
  Coverage        64.00%   64.01%           
============================================
  Files              317      317           
  Lines            25632    25635    +3     
============================================
+ Hits             16407    16410    +3     
  Misses            9225     9225           

Impacted Files	Coverage Δ
include/ignition/gazebo/Server.hh	100.00% <ø> (ø)
src/Server.cc	89.93% <100.00%> (+0.20%)	⬆️

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Addressed

[chapulina]

LGTM when CI comes back happy