Fix test_cli_fsencoding on Python 3.7, take 2
0a5a7bdef7c300cb8f8a8128ce6cf5b115683cbe introduced another problem. The
test is now failing on systems without a full IPA client or server
installation. Use IPA_CONFDIR env var to override location of
default.conf, so that the command always fails.
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Serhii Tsymbaliuk <stsymbal@redhat.com>