Allow disabling seccomp or changing the whitelist

Without this change, once a service is started with seccomp, it is
impossible to restart it without seccomp or change the whitelist file
name. This commit fixes that. Disabling seccomp is as easy as
commenting out the "procd_set_param seccomp" line in init.d script.

Signed-off-by: Michal Sojka <michal.sojka@cvut.cz>

service/instance.c

@@ -639,6 +639,11 @@ instance_config_changed(struct service_instance *in, struct service_instance *in
 	if (in->respawn_timeout != in_new->respawn_timeout)
 		return true;
 
+	if ((!in->seccomp && in_new->seccomp) ||
+	    (in->seccomp && !in_new->seccomp) ||
+	    (in->seccomp && in_new->seccomp && strcmp(in->seccomp, in_new->seccomp)))
+		return true;
+
 	if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 		return true;
 
@@ -959,6 +964,7 @@ instance_config_move(struct service_instance *in, struct service_instance *in_sr
 	in->respawn_timeout = in_src->respawn_timeout;
 	in->name = in_src->name;
 	in->trace = in_src->trace;
+	in->seccomp = in_src->seccomp;
 	in->node.avl.key = in_src->node.avl.key;
 
 	free(in->config);