Fix tests on Python3.10
Fix tests on Python3.10

Both test_property_protection_with_missing_operation and
test_property_protection_with_misspelt_operation rely on a bug in Python
3.9: the "]" character in a section name is not read, so section
'^[0-9]' is read as '^[0-9'. This causes _compile_rule to fail and raise
the exception the tests are expecting.

In Python 3.10, this bug has been fixed and the exception is no longer
raised. Instead, CONFIG.get() raises a NoOptionError in _load_rules,
which is not caught.

Closes-Bug: #1954321
Change-Id: Ibce11ac002dc900299d478ea875797dd1f8df17e

openstack/glance,openstack/glance,openstack/glance