[ipa/server] Change how the check for ipa-replica-install is being done
    
    As found on in https://pagure.io/fedora-infrastructure/issue/12149 the current
    method of checking if the ipa-replica-install have to be executed is not
    reliable enough.
    
    Let's instead check for log file that is created during the installation. This
    will need manual intervention in case the ipa-replica-install needs to be run
    again, but it will be much more reliable otherwise.
    
    Signed-off-by: Michal Konecny <mkonecny@redhat.com>