Fix remaining errors in mocked end2end tests

[andy-maier]

See make end2end_mocked, e.g. in test runs.

Note there are also issues #1248 and #1247 and #1541 whose fixes will remove errors in the end2end_mocked tests. This ticket here is for the remaining issues.

With PR #1539 in place, the remaining issues are at this point:

FAILED tests/end2end/test_lpar.py::test_console_list_permitted_lpars[hmc_definition=mocked_hmc_z16-Full properties-input_kwargs6-exp_prop_names6] - AssertionError: Property 'has-operating-system-messages' missing from returned LPAR properties, got: {'parent': '/api/cpcs/cpc1', 'class': 'logical-partition', 'object-id': 'lpar1', 'object-uri': '/api/...

FAILED tests/end2end/test_storage_group.py::test_stogrp_crud[hmc_definition=mocked_hmc_z16] - AssertionError: Unexpected value for property 'shared' of storage group:
F