Bug 470576 - Migration could do addition checks before commiting actions
    
    https://bugzilla.redhat.com/show_bug.cgi?id=470576
    
    The migrate-ds-admin.pl can fail for various reasons leaving the server
    in an inconsistent state. Sometimes a manual cleanup is required before
    the migration script can be run again. There is no easy way to revert the
    changes done by this script, so the script has been modified such that it
    can handle inconsistent state better.
    
    The 25changefedorato389.pl has been modified such that it will only
    delete old entries if the entries are actually renamed. If the old entry
    is already using the new name it will not be deleted.
    
    The 25changefedorato389.pl has also been modified such that it doesn't
    return immediately when it doesn't find anything to change, but it will
    continue executing the rest of the script, i.e. deleting bogus entries,
    adding new entries, updating adm.conf and local.conf, and deleting old
    entries.
    
    The migrateAdminServer() has been modified to stop the admin server before
    migrating it.
    
    The start-ds-admin has been modified to wait until the pid file is created
    before returning a success.