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On an OS X laptop, the variable `$HOST` changes a lot depending
on what wifi network you're connected to.  This causes a lot
of `~/.ssh/environment-$HOST` files to be created and
causes multiple ssh-agents to created.

Instead, use `scutil --get ComputerName` to get something
more stable.

By default, ssh-agent stores identities forever. It has an option to
set a maximum lifetime for identites (useful to expire passphrase protected
keys). Allow this option to be set using:

zstyle :omz:plugins:ssh-agent lifetime <time>

OpenBSD doesn't have -ef flags for ps. Both linux and OpenBSD have -x flags which works just as greate here

Reorganizing plugins so that each plugin has it's own directory now so that any plugin-specific functions can be bundled within there.