"doveadm sync/backup" and SSH should use "ssh-agent" if available

[Jesus Cea]

I use SSH-AGENT in my system, to cache SSH credentials and avoid typing
my key every time I connect to a remoto host.

But "doveadm sync/backup", when one of the ends is SSH accessed, doesn't
use the available SSH-AGENT and forces me to type my password.

-- 
Jesús Cea Avión                         _/_/      _/_/_/        _/_/_/
jcea at jcea.es - http://www.jcea.es/     _/_/    _/_/  _/_/    _/_/  _/_/
Twitter: @jcea                        _/_/    _/_/          _/_/_/_/_/
jabber / xmpp:jcea at jabber.org  _/_/  _/_/    _/_/          _/_/  _/_/
"Things are not so easy"      _/_/  _/_/    _/_/  _/_/    _/_/  _/_/
"My name is Dump, Core Dump"   _/_/_/        _/_/_/      _/_/  _/_/
"El amor es poner tu felicidad en la felicidad de otro" - Leibniz

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