enhance e2e test for upstream

[nic-chen]

here is the detail list:

• key: remote_addr, query_string, arg_xxx
• hash_on: consumer, header, cookie

[nic-chen]

@idbeta

[membphis]

we can only implement some important feature in 2.1.1

[idbeta]

Hi, please assign it to me.

[nic-chen]

updated.

[idbeta]

@nic-chen I submitted 3 PRs to solve this issue, #897 #932 #936 , and some cases todo: hash_on: vars, health check: basic config.