bug: host pass error with dashboard 2.0

[gy09535]

Issue description

When we set upstream in dashboard ,the value of "upstream.pass_host" not be set, after that we set the nodes with domain, the domain value should be set to the backend node, but it not be set. because of the pass_host default value is pass( ref: https://github.com/apache/apisix/blob/master/apisix/schema_def.lua#L360 ), it can not execute the node host set logical(ref: https://github.com/apache/apisix/blob/master/apisix/init.lua#L306-L327 and https://github.com/apache/apisix/blob/master/apisix/init.lua#L467-L473). I have fixed it change the upstream default value to node, I think it is not a good idea, we should add the config in dashboard ui 2.0.

Environment

• apisix version (cmd: apisix version):
• OS: (cmd: uname -a)
• OpenResty / Nginx version: (cmd: nginx -V or openresty -V)

Minimal test code / Steps to reproduce the issue

What's the actual result? (including assertion message & call stack if applicable)

What's the expected result?

[nic-chen]

Do you mean dashboard need to support config pass_host?

[gy09535]

Do you mean dashboard need to support config pass_host?

yeah, when we want change the backend service host, we can change it to node.

[juzhiyuan]

already supported yesterday, please check.

[juzhiyuan]

#1088