feat(pubsub/pstest): support listening on custom address

[larryanz]

Regarding #11569, this PR adds support of pstest test server to listening on custom hosts rather than only localhost.

Due to CI running issue, this is the second part of the changes. Which only includes changes of pstest.
Part 1 is #11586

[larryanz]

hi @hongalex please help to take a look

[larryanz]

It seems ci uni tests failed caused by some code outdates. I have just rebased the branch and double check it on my local. please help to run ci again, thanks @hongalex , this feature is important to me now.
https://btx.cloud.google.com/invocations/fbe78021-caac-4695-9f2a-27a3c7c2aea0/log

go: downloading cloud.google.com/go/longrunning v0.6.4
# cloud.google.com/go/pubsub/pstest
pstest/fake.go:139:23: undefined: testutil.NewServerWithAddress
FAIL	cloud.google.com/go/pubsub [build failed]
?   	cloud.google.com/go/pubsub/apiv1/pubsubpb	[no test files]
?   	cloud.google.com/go/pubsub/internal	[no test files]
?   	cloud.google.com/go/pubsub/internal/benchwrapper	[no test files]
?   	cloud.google.com/go/pubsub/internal/benchwrapper/proto	[no test files]
=== RUN   TestPublisherSmoke

[larryanz]

something weird here, in codebase we already rebased the code onto main, then we already have the method testutil.NewServerWithAddress, then why the ci continues to fail

[hongalex]

This is likely waiting on the new release of cloud.google.com/go. I don't see a release where your previous PR got included though. @quartzmo can you confirm how we can get #11586 in a release?

[hongalex]

@quartzmo will take a look at this next week when the next release triggers

[larryanz]

May I ask for the release cycle? In the docs i saw that the lib will be released automatically, but for testutil you said we have it in weekly cycle, then for pubsub/pstest, when we will have it @hongalex ?

[hongalex]

This PR is currently blocked until the testutil changes you made in the other PR is part of some release. There may be an issue but I'm not sure when it will trigger, and when I spoke to @quartzmo he said he can take a look next week.

After that lands, we would upgrade the cloud.google.com/go version in pubsub/go.mod which should make the tests pass.