Check direct/reverse hostname/address resolution in ipa-replica-install
    
    Forward and reverse resolution of the newly created replica is already
    checked via get_host_name (which calls verify_fqdn).
    Add the same check for the existing master.
    
    Additionally, if DNS is installed on the remote host, check forward
    and reverse resolution of both replicas using that DNS only
    (ignoring /etc/hosts). These checks give only warnings and, in interactive
    installs, a "Continue?" prompt.
    
    https://fedorahosted.org/freeipa/ticket/2845