move Python tests in-process

This is nice to make them more easily debuggable.
A series of crude hacks are employed to bootstrap enough services from
python so the current tests run.
This is only tested with system python3 on Fedora.

Change-Id: I5e06741e55ead7fddec41ff776ff8ca5d2399469
Reviewed-on: https://gerrit.libreoffice.org/3215
Reviewed-by: David Ostrovsky <David.Ostrovsky@gmx.de>
Tested-by: David Ostrovsky <David.Ostrovsky@gmx.de>

sw/qa/unoapi/python/get_expression.py

@@ -1,5 +1,5 @@
 import unittest
-from org.libreoffice.unotest import UnoConnection
+from org.libreoffice.unotest import UnoNotConnection as UnoConnection
 
 class TestGetExpression(unittest.TestCase):
     _unoCon = None