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Fixes #1131
At some point support for Db2 z/os was broken, this PR reintroduces support by separating the initial handshake request to two packets, using the response from the first packet to determine if we are talking to z/os, and if so switching from EBCDIC to UTF8.
There are 3 tests still failing with Db2/z, which will be addressed in a follow up issue: #1205