Description of problem:
`sudo realm leave -v -U ${NAME} ${ADDS}` uses wrong authselect syntax with:
`/usr/bin/authselect sssd with-mkhomedir`
it must be
`/usr/bin/authselect select sssd with-mkhomedir`

The error message is not shown without '-v' option for `realm leave`.


Version-Release number of selected component (if applicable):
$ rpm -q realmd
realmd-0.16.3-11.fc28.x86_64

How reproducible:
easy, 100%

Steps to Reproduce:
1. install Fedora 28 Workstation x86_64 (or minimal environment)
2. install group "Domain Membership"
3. join Microsoft Active Directory Domain (ADDS) (FreeIPA domain is affected too)
4. $ sudo realm leave -v -U ${NAME} ${ADDS}

Actual results:
Password for ${NAME}: 
...
 * Removing domain configuration from sssd.conf
 * /usr/bin/authselect sssd with-mkhomedir
Usage:
/usr/bin/authselect COMMAND COMMAND-ARGS

Available commands:
- select             Select profile
- list               List available profiles
- show               Show profile information
- current            Get identificator of currently selected profile
- check              Check if the current configration is valid
- test               Print changes that would be otherwise written
- enable-feature     Enable feature in currently selected profile
- disable-feature    Disable feature in currently selected profile

Common options:
  --debug            Print error messages
  --trace            Print trace messages
  --warn             Print warning messages

Help options:
  -?, --help         Show this for a command
  --usage            Show brief usage message for a command
 ! Disabling sssd in PAM failed.
 * /usr/bin/systemctl disable sssd.service
Removed /etc/systemd/system/multi-user.target.wants/sssd.service.
 * /usr/bin/systemctl stop sssd.service
 * Successfully unenrolled machine from realm

Expected results:
....
 * /usr/bin/authselect select sssd 
....

Additional info:
I pushed the fix upstream and was asked to create this Bugzilla ticket for proper tracking: https://src.fedoraproject.org/rpms/realmd/pull-request/1