fixes premature sys.exit in ipa-replica-manage del

Deletion of a replica would fail should there
be no RUVs on the server.

Also removed some dead code in del_master_managed which might
cause premature exit if RuntimeError occurs.

https://fedorahosted.org/freeipa/ticket/5307

Reviewed-By: Martin Basti <mbasti@redhat.com>

install/tools/ipa-replica-manage

@@ -465,9 +465,12 @@ def get_rid_by_host(realm, sourcehost, host, dirman_passwd, nolookup=False):
     """
     try:
         servers = get_ruv(realm, sourcehost, dirman_passwd, nolookup)
-    except (NoRUVsFound, RuntimeError) as e:
+    except RuntimeError as e:
         print(e)
-        sys.exit(0 if isinstance(e, NoRUVsFound) else 1)
+        sys.exit(1)
+    except NoRUVsFound as e:
+        print(e)
+        servers = []
     for (netloc, rid) in servers:
         if '%s:389' % host == netloc:
             return int(rid)
@@ -963,10 +966,6 @@ def del_master_managed(realm, hostname, options):
     #    And pick new CA master.
     ensure_last_services(api.Backend.ldap2, hostname, masters, options)
 
-    # Save the RID value before we start deleting
-    rid = get_rid_by_host(realm, options.host, hostname,
-                          options.dirman_passwd, options.nolookup)
-
     # 5. Remove master entry. Topology plugin will remove replication agreements.
     try:
         api.Command.server_del(hostname_u)