SBUS: increase SBUS_MESSAGE_TIMEOUT to 5 mins

Handling BE_REQ_INITGROUPS for LDAP user with 10k groups takes longer
than 2 mins.

Reviewed-by: Pavel Březina <pbrezina@redhat.com>
Reviewed-by: Sumit Bose <sbose@redhat.com>

Author: alexey-tikhonov

src/sbus/sbus_message.h

@@ -29,8 +29,10 @@
 
 /* Use longer default timeout than libdbus default due to expensive
  * selinux operation: see https://bugzilla.redhat.com/show_bug.cgi?id=1654537
+ * Another example of a very long running operation - BE_REQ_INITGROUPS where
+ * the user is a member of tens of thousands of groups.
  */
-#define SBUS_MESSAGE_TIMEOUT 120000
+#define SBUS_MESSAGE_TIMEOUT 300000
 
 /**
  * Bound message with a talloc context.