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This avoid spawning additional processes, as the $USER variable will
**always** contain the current logged-in user.

Signed-off-by: Mariusz Fik <fisiu@opensuse.org>

The manual configuration of ':completion:*:hosts' causes some problems
(e.g. issue #1337), and misses useful information (especially from
~/.ssh/known_hosts; issue #690 and issue #1009).

The best option appears to be using zsh's default configuration for
':completion:*:hosts'.

While rebasing this for a new pull request (#1498 got closed by accident
and then requests to re-open it got ignored), it also drops the `users
off` setting: completion of user names can be useful, and the commit
adding it (c4434d2d) does not state why.

Main library should use ZSH native hostname function

Add all hosts found in ~/.ssh/config.
Tip found on: http://www.nerux.org/wiki/OpenSSH#coupler_avec_zsh_completion

After a few weeks of using this, I'd prefer this to not be enabled by default. My bad for suggesting that in the first place.

This reverts commit fc49b4a4.

This reverts commit c3a58b00.

Use /etc/hosts in addtion to $HOME/.ssh/known_hosts as the source for
hostname completion

Turn on completion caching to speed up certain comands

When completing usernames, don't include system accounts by default

The key here is not using MENU_COMPLETE which autoselects the first
entry, but using AUTO_MENU which displays the menu but autoselects
on successive tab hit.

Also, do not use zstyle menu yes because that somehow overrides
the setopts.

Only using the contents of .ssh/known_hosts when the file exists for ssh/scp auto-completion. Closes issue #20

Moving all zsh config options into a lib/ subdirectory to make way for some upcoming changes to directory structure and configuration options