We were seeing the following test failures on Python 3.12:
openstackclient.tests.unit.common.test_module.TestModuleList.test_module_list_all
openstackclient.tests.unit.common.test_module.TestModuleList.test_module_list_no_options
Both failures were caused by missing attributes of 'sys', e.g.
AttributeError: module 'sys' has no attribute 'builtin_module_names'
Fix this by exposing the real 'sys' module as part of our mock of
'sys.modules'.
Change-Id: I17391a46f08896f49dccaf75ad685dab1375a03d
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
4c31284936