Replica inst. fix: do not require -r, -a, -p options in unattended mode
Previous patches for this ticket introduced error, that replica install
requires to specify -r, -p and -a option in unattended mode.
This options are not needed on replica side.
https://fedorahosted.org/freeipa/ticket/4517
Reviewed-By: Milan KubĂk <mkubik@redhat.com>