```
security/sudo: Addming sssd flavor to sudo
Some user ask to add a flavor to permit to have sudo alredy
packaged with sssd2 dependency (former sssd will not being added
as a flavor since it is deprecated).
This patch add this functionality and has been tested (both
flavors default and sssd) with poudriere under 13.4-RELEASE.
Sponsored by: Klara, Inc.
Approved by: 0mp (mentor)
```