Let the framework be able to override the hostname.
    
    The hostname is passed in during the server installation. We should use
    this hostname for the resulting server as well. It was being discarded
    and we always used the system hostname value.
    
    Important changes:
    - configure ipa_hostname in sssd on masters
    - set PKI_HOSTNAME so the hostname is passed to dogtag installer
    - set the hostname when doing ldapi binds
    
    This also reorders some things in the dogtag installer to eliminate an
    unnecessary restart. We were restarting the service twice in a row with
    very little time in between and this could result in a slew of reported
    errors, though the server installed ok.
    
    ticket 1052