build: move COLO under CONFIG_REPLICATION

We don't allow to use x-colo capability when replication is not
configured. So, no reason to build COLO when replication is disabled,
it's unusable in this case.

Note also that the check in migrate_caps_check() is not the only
restriction: some functions in migration/colo.c will just abort if
called with not defined CONFIG_REPLICATION, for example:

    migration_iteration_finish()
       case MIGRATION_STATUS_COLO:
           migrate_start_colo_process()
               colo_process_checkpoint()
                   abort()

It could probably make sense to have possibility to enable COLO without
REPLICATION, but this requires deeper audit of colo & replication code,
which may be done later if needed.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Acked-by: Dr. David Alan Gilbert <dave@treblig.org>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20230428194928.1426370-4-vsementsov@yandex-team.ru>
Signed-off-by: Juan Quintela <quintela@redhat.com>

hmp-commands.hx

@@ -1052,6 +1052,7 @@ SRST
   migration (or once already in postcopy).
 ERST
 
+#ifdef CONFIG_REPLICATION
     {
         .name       = "x_colo_lost_heartbeat",
         .args_type  = "",
@@ -1060,6 +1061,7 @@ ERST
                       "a failover or takeover is needed.",
         .cmd = hmp_x_colo_lost_heartbeat,
     },
+#endif
 
 SRST
 ``x_colo_lost_heartbeat``