[SSSD] [sssd PR#572][comment] winbind idmap plugin: support inferface version 6

[abbra]

  URL: https://github.com/SSSD/sssd/pull/572
Title: #572: winbind idmap plugin: support inferface version 6

abbra commented:
"""
The test looks good to me. Calling `smb_register_idmap(version, NULL, NULL)` would return
either `NT_STATUS_INVALID_PARAMETER` or `NT_STATUS_OBJECT_TYPE_MISMATCH`, without going
further, so we are really just check the value of SMB_IDMAP_INTERFACE_VERSION compiled
into the Samba private library.
"""

See the full comment at https://github.com/SSSD/sssd/pull/572#issuecomment-390150243