Merge AD trust configurator into replica installer
    
    `ipa-replica-install` is now able to configure Samba and winbind
    services in order to manage Active Directory trusts. `--add-agents`
    option is exposed in replica installer, while `--add-sids` now defaults
    to `False` since adding a first AD trust controller to an existing
    sizeable deployment can result in stuck installation as sidgen tasks can
    take a long time to complete. That's why adding SIDs should be a
    conscious decision in this case.
    
    https://fedorahosted.org/freeipa/ticket/6630
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>