Db2 z/OS support

[nj1973]

Is your feature request related to a problem? Please describe.
When testing DVT on Db2 z/OS many features work but some do not.

Creating issue/branch to track this workstream.

What version of DVT are you using?
8.3.0

What type of connections are you using for source and target?
Db2 11.5 on z/OS

Describe the solution you'd like
Functional support as close as possible to Db2 LUW

[nj1973]

Connectivity fails due to:

cur.execute("SET TIMEZONE = UTC")

it appears that the alternative:

cur.execute("SET SESSION TIME ZONE = '00:00'")

Works on both LUW & z/OS.

[nj1973]

find-tables is returning an empty list, even when using the same source and target connections.