Add '!=' operator to query language

bin/varnishtest/tests/l00001.vtc

@@ -36,3 +36,10 @@ logexpect l1 -d 1 -g vxid -q "RespStatus == 200" {
 	expect * =	ReqEnd
 	expect * =	End
 } -run
+
+# Test '!=' operator
+logexpect l1 -d 1 -g vxid -q "RespStatus != 503" {
+	expect * *	Begin	req
+	expect * =	ReqEnd
+	expect * =	End
+} -run

lib/libvarnishapi/vsl_query.c

@@ -103,6 +103,15 @@ vslq_test_rec(const struct vex *vex, const struct VSLC_ptr *rec)
 		default:
 			INCOMPL();
 		}
+	case T_NEQ:		/* != */
+		switch (val->type) {
+		case VEX_INT:
+			if (val->val_int != recint)
+				return (1);
+			return (0);
+		default:
+			INCOMPL();
+		}
 	case T_SEQ:		/* eq */
 		assert(val->type == VEX_STRING);
 		if (reclen == val->val_stringlen + 1 &&