UTIL: Convert bool mpg to an enum mpg_mode
Instead of bool mpg inside struct sss_domain_info, let's introduce enum
mpg_mode that currently maps pretty much 1:1 to the boolean. In future
patches, a third value will be added.
Also adds a getter for the mpg_mode value because we want to discourage
getting or setting the value directly. Instead, the sss_domain_info
structure should be opaque in the future.
Related:
https://pagure.io/SSSD/sssd/issue/3822
Reviewed-by: Michal Židek <mzidek@redhat.com>
(cherry picked from commit 7c83450aba0a89890d1f15079978ae8b2a788a68)