core: kemi - backpup and restore old context inside sr_kemi_ctx_route()

(cherry picked from commit 0689ac5)
(cherry picked from commit cb1b346)

src/core/kemi.c

@@ -1685,6 +1685,12 @@ int sr_kemi_route(sr_kemi_eng_t *keng, sip_msg_t *msg, int rtype,
 int sr_kemi_ctx_route(sr_kemi_eng_t *keng, run_act_ctx_t *ctx, sip_msg_t *msg,
 		int rtype, str *ename, str *edata)
 {
+	run_act_ctx_t *bctx;
+	int ret;
+
+	bctx = sr_kemi_act_ctx_get();
 	sr_kemi_act_ctx_set(ctx);
-	return sr_kemi_route(keng, msg, rtype, ename, edata);
+	ret = sr_kemi_route(keng, msg, rtype, ename, edata);
+	sr_kemi_act_ctx_set(bctx);
+	return ret;
 }