Use api.env.nss_dir instead of paths.IPA_NSSDB_DIR
ipaclient plugins are now using nss_dir from api.env instead of
hard-coded paths.IPA_NSSDB_DIR.
Closes: https://fedorahosted.org/freeipa/ticket/6386
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Tomas Krizek <tkrizek@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>