orgalorg: fix test dependency on ssh

[gordonbondon]

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Without this change testing of the formula depends on whether SSH_AUTH_SOCK actually points to active ssh-agent, or if you have private ssh key in default path, both can vary depending on OS version or your setup.

Currently, it sometimes fails like this:

==> /usr/local/Cellar/orgalorg/1.1.1/bin/orgalorg -u tester --host=127.0.0.1:56240 -C uptime 2>&1
Error: orgalorg: failed
An exception occurred within a child process:
  Minitest::Assertion: Expected /connecting\ to\ cluster\ failed/ to match "2021-08-17 19:30:43 [FATAL] can't create runner factory\n                            └─ unable to dial to ssh agent socket: /private/tmp/com.apple.launchd.eR353DMPva/Listeners\n                               └─ dial unix /private/tmp/com.apple.launchd.eR353DMPva/Listeners: connect: no such file or directory\n".

Required to unblock #83413

[carlocab]

Thanks, @gordonbondon!