DNS Locations: extend server-* command with locations

Server find, server show, server mod should work with IPA locations.

https://fedorahosted.org/freeipa/ticket/2008

Reviewed-By: Petr Spacek <pspacek@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>

ipaserver/plugins/location.py

@@ -106,7 +106,7 @@ class location(LDAPObject):
     )
 
     def get_dn(self, *keys, **options):
-        loc = keys[-1]
+        loc = keys[0]
         assert isinstance(loc, DNSName)
         loc_a = loc.ToASCII()