Fix object identities for pg_conversion objects

We were neglecting to schema-qualify them.

Backpatch to 9.3, where object identities were introduced as a concept
by commit f8348ea32e.

src/backend/catalog/objectaddress.c

@@ -3415,6 +3415,7 @@ getObjectIdentityParts(const ObjectAddress *object,
 			{
 				HeapTuple	conTup;
 				Form_pg_conversion conForm;
+				char	   *schema;
 
 				conTup = SearchSysCache1(CONVOID,
 										 ObjectIdGetDatum(object->objectId));
@@ -3422,10 +3423,13 @@ getObjectIdentityParts(const ObjectAddress *object,
 					elog(ERROR, "cache lookup failed for conversion %u",
 						 object->objectId);
 				conForm = (Form_pg_conversion) GETSTRUCT(conTup);
+				schema = get_namespace_name(conForm->connamespace);
 				appendStringInfoString(&buffer,
-								quote_identifier(NameStr(conForm->conname)));
+								quote_qualified_identifier(schema,
+														   NameStr(conForm->conname)));
 				if (objname)
 					*objname = list_make1(pstrdup(NameStr(conForm->conname)));
+				pfree(schema);
 				ReleaseSysCache(conTup);
 				break;
 			}

src/test/regress/expected/object_address.out

@@ -370,7 +370,7 @@ SELECT (pg_identify_object(addr1.classid, addr1.objid, addr1.subobjid)).*,
  cast                      |            |                   | (bigint AS integer)                                                  | t
  table constraint          | addr_nsp   |                   | a_chk on addr_nsp.gentable                                           | t
  domain constraint         | addr_nsp   |                   | domconstr on addr_nsp.gendomain                                      | t
- conversion                | pg_catalog | ascii_to_mic      | ascii_to_mic                                                         | t
+ conversion                | pg_catalog | ascii_to_mic      | pg_catalog.ascii_to_mic                                              | t
  language                  |            | plpgsql           | plpgsql                                                              | t
  schema                    |            | addr_nsp          | addr_nsp                                                             | t
  operator class            | pg_catalog | int4_ops          | pg_catalog.int4_ops for btree                                        | t