Usability, a servivce stopped by a user is stopped, not blocked

The generic term for a non-running service is blocked, but a service may
be blocked for several different reasons.  When a user stops a service
with `initctl stop` the intuitive expected output from `initctl show` is
"stopped" not "blocked".

When the user later restarts the service with `initctl start` it may of
course be blocked due to wrong runlevel or a missing condition.  As can
be expected from the service's configuration.

The rest of the patch refactors the internal API names a bit to reflect
this change.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/svc.c

@@ -480,7 +480,7 @@ char *svc_status(svc_t *svc)
 			return "crashed";
 
 		case SVC_BLOCK_USER:
-			return "blocked";
+			return "stopped";
 
 		case SVC_BLOCK_BUSY:
 			return "busy";