Issue description

1. create route_1 with upstream_1
2. create route_2 with upstream_2
3. test client create TLS connection (certificate) with apisix
4. test client request route_1, should access the upstream_1
5. test client request route_2, should access the upstream_2

It should be tested in both openresty 1.19 and openresty 1.17

relate #3079

Environment

• apisix version (cmd: apisix version):
• OS: