Description:

Fix various test issues on RHEL7 and RHEL8:

• systemd on RHEL7 doesn't have --value option.
  Drop --value option and parse the output manually.

• Use newer BDB config only on 1.4.2+.

• Skip tests/suites/password/pbkdf2_upgrade_plugin_test.py on <1.4.1.

• Unhashed passwords are not logged by default only on 1.4.1.6+.

• String literal comparison doesn't work with double digits,
  i.e. '1.3.10.1' > '1.3.2.1' returns False.
  Use packaging.version to compare versions.

• Don't use nsAccount objectClass on versions <=1.4.x.

• Update skipif/xfail version to match downstream versions too.

Relates: https://pagure.io/389-ds-base/issue/49761