Fix test_conn_error_other on mac

[stepancheg]

On macos, the error is

Error { etype: InternalError, esource: Unset, retry: Decided(false), cause: Some(Error { etype: BindError, esource: Unset, retry: Decided(false), cause: Some(Os { code: 49, kind: AddrNotAvailable, message: "Can't assign requested address" }), context: Some(Owned("Fail to connect to 240.0.0.1:80")) }), context: Some(Owned("Fail to connect to addr: 240.0.0.1:80, scheme: HTTP,")) }

[drcaramelsyrup]

Thanks for this, left a minor comment nit.

[drcaramelsyrup]

Can we also add a comment explaining why we have the InternalError check here (i.e. "the error seen on mac is...")?

[stepancheg]

Done.

I added link to this PR, full error text might be too long to be included in code comments.