Incomplete support for ssh-add and pkcs#11

[Lachezar Dobrev]

Completion for the ssh-add does not work when trying to add/remove a PKCS#11 library.
Completion for the 'ssh-add -s' should suggest any .so (and directories).

[Lachezar Dobrev (lachezar)]

The proposed patch adds support for suggesting directories and .so files when using -s.
The proposed patch adds support for suggesting registered .so libraries when using -e.

The proposed patch should be brought up to bash-completion project standards (especially considering the piped commands).

[Lachezar Dobrev (lachezar)]

I revised the patch:
- Removed explicit directory suggesting, the .so suggesting includes directories (for browsing).
- Reworked extracting the current .so registered, based on the completion for umount.
I suspect this patch may be applied as-is, but it still needs auditing.

[Ubuntu Foundations Team Bug Bot (crichton)]

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