service: On check req check for minimal kernel support

When RPC is being requested to check the kernel, it's
enough to check the minimal amount of kernel feature.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-service.c

@@ -233,6 +233,9 @@ static int check(int sk)
 
 	resp.type = CRIU_REQ_TYPE__CHECK;
 
+	/* Check only minimal kernel support */
+	opts.check_ms_kernel = true;
+
 	if (!cr_check())
 		resp.success = true;