user option for rsync-push

[tdawson]

I usually run rsync-push as user with a different name than my FAS id. This causes problems with syncing.
Please add a user option for rsync-push.sh.

[contyk]

I recommend adding the fedorapeople.org host in your ~/.ssh/config, e.g.

Host fedorapeople.org
    Hostname fedorapeople.org
    User tdawson

[igor-raits]

@contyk btw, you don't need to explicitly say HostName in there if it matches Host ;)