ipaconfig: Prevent configuration issues due to test failure.

Currently, if a test fails during execution of ipaconfig playbook
tests, or if the failed task is the task reverting to the original
configuration fails, the testing host might be left in a state that
may cause other tests to fail due to the inconsistent configuration
state.

This patch ensures that if a test fails, a known configuration, the
same as used is the default installation of FreeIPA used in upstream
CI, is applied to the host, providing safe environment for testing.