[WFLY-14815] Fix ForwardedHandlerTestCase to comply with UNDERTOW-1837

[fl4via]

Jira: https://issues.redhat.com/browse/WFLY-14815

This is the second part of the fix required to make ForwardedHandlerTestCase compliant with UNDERTOW-1837.
The first part is #14314
Requires upgrade of WildFly Core with Undertow upgrade: wildfly/wildfly-core#4604

[bstansberry]

I'm going to kill the CI jobs on this as we know the tests won't pass yet.

[bstansberry]

/retest

[spyrkob]

@fl4via should the expected values be set to something like

final InetAddress address = InetAddress.getByName(url.getHost());
final String localAddrName = address.getHostName();
final String localAddr = address.getHostAddress() + ":" + url.getPort();

to get the values of address server is bound to?

[fl4via]

@spyrkob possibly, I'm going to give it a try.

[spyrkob]

The SM testsuite fails because resolving hostname requires SocketPermission(host, "resolve")). Since that's expected behaviour is it OK to just add the permission to the test deployment?

[bstansberry]

@spyrkob @fl4via Yes, adding the permission to the deployment is the correct thing to do.

[fl4via]

@spyrkob thanks for your commit! @bstansberry I hope the tests will pass now :-)