[UNDERTOW-2249] Add more info to the IOException thrown by ClientConnection #1454
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, differentiating the upgrade states from closed ones. At HttpClientTestCase.testSslServerIdentity, enforce that the exception is either a ClosedChannelException or it is an IOException with the message for invalid closed state message.
Jira: https://issues.redhat.com/browse/UNDERTOW-2249
Alternative to PR #1455
Which option should be chosen is being discussed at Zulip: https://wildfly.zulipchat.com/#narrow/stream/174183-undertow/topic/Should.20ClientConnection.20request.20get.20IOException.20when.20closed.3F