Set the go-cold timer on newly loaded warm auto VCLs

Newly loaded VCLs didn't get their go cold timer set even when they
were set to auto, causing them to never go cold automatically.

Fixes: #2270

bin/varnishd/mgt/mgt_vcl.c

@@ -481,8 +481,13 @@ mgt_new_vcl(struct cli *cli, const char *vclname, const char *vclsrc,
 		mgt_vcl_del(vp);
 		VCLI_Out(cli, "%s", p);
 		VCLI_SetResult(cli, status);
+		free(p);
+		return;
 	}
 	free(p);
+
+	if (vp->warm && !strcmp(vp->state, "auto"))
+		vp->go_cold = VTIM_mono();
 }
 
 /*--------------------------------------------------------------------*/

bin/varnishtest/tests/r02270.vtc

+varnishtest "Test that never used VCLs go cold automatically"
+
+server s1 {
+	rxreq
+	txresp
+} -start
+
+varnish v1 -arg "-p vcl_cooldown=1" -vcl+backend {
+} -start
+
+varnish v1 -expect VBE.vcl1.s1.happy >= 0
+
+varnish v1 -cliok {vcl.inline vcl2 "vcl 4.0; backend s1 {.host = \"${s1_addr}\"; .port = \"${s1_port}\"; }"}
+
+varnish v1 -expect VBE.vcl2.s1.happy >= 0
+
+delay 5
+
+varnish v1 -expect !VBE.vcl2.s1.happy