Refactor listener closing code

[wjordan]

Description

This PR fixes a bug/issue where a Unix socket created for a control server (e.g., --control-url unix://control.sock) was not being properly removed on server shutdown.

This fix has two parts:

1. Binder#parse adds its urls to @listeners allowing them to be automatically cleaned up by Binder#close_listeners when the server shuts down, and the code path setting up the control-server listeners was not adding its urls to this array. Simplify Runner#start_control URL parsing #2111 (which this PR extends) fixes this part by simplifying the control-server code to call Binder#parse instead.
2. The control server was only being stopped on shutdown, but the associated listeners were never closed. This PR adds a call to close_binder_listeners to always close the control listeners as well.

I've modified the pumactl integration tests to ensure the unix paths are cleaned up after getting shutdown by halt and stop commands. (Both tests fail without the fix in this PR.)

Finally, for related cleanup the call to @binder.close_unix_paths on launcher shutdown was no longer needed (because closing listeners is handled more consistently by calls to close_binder_listeners). I've removed this method to simplify the interface.

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[nateberkopec]

Confirmed test fails on master 👍

[MSP-Greg]

Confirmed test fails on master

Actually, Actions can't download the Ruby binary, although all of the Ruby binaries are downloaded on install..

Both the Ubuntu & macOS files come from the same place, https://github.com/ruby/ruby-dev-builder/releases. Why it can retrieve the macOS fine, but not Ubuntu is odd. The code used is standard GitHub code, it may not have any retry code, I'm not sure...

[nateberkopec]

@MSP-Greg sorry, I meant I did a checkout on that test locally against the master branch, and it fails on master branch

[nateberkopec]

This may have broken the 2.2 build though, ugh.

[nateberkopec]

2.2 on Travis will be the death of me, I'm sure.

[MSP-Greg]

2.2 on Travis will be the death of me, I'm sure.

Don't know if I mentioned it, but 2.2 was left out of Actions CI because...

See https://bugs.ruby-lang.org/issues/13239

It was not backported to 2.2. Maybe it's time?

[MSP-Greg]

JFYI, I added two 'unless <io>.closed?' statements, and Actions Ruby 2.2 was failing on:

TestLauncher#test_dependencies_and_files_to_require_after_prune_is_correctly_built_with_extra_deps [/home/runner/work/puma/puma/test/test_launcher.rb:30]:
Expected /puma\/lib$/ to match # encoding: US-ASCII
#    valid: true
"/home/runner/work/puma/extensions/x86_64-linux/2.2.0-static/puma-4.3.3".

  2) Failure:
TestLauncher#test_dependencies_and_files_to_require_after_prune_is_correctly_built_for_no_extra_deps [/home/runner/work/puma/puma/test/test_launcher.rb:14]:
Expected /puma\/lib$/ to match # encoding: US-ASCII
#    valid: true
"/home/runner/work/puma/extensions/x86_64-linux/2.2.0-static/puma-4.3.3".