VALIDATORS: Remove application section domain
Application domains can use the same options as normal domains section
with one more additional option.
We could either duplicate all options from the domain section also in
the application domain section + add the one additional option or
add this one option to the domain section even though it is not meant
to be used there to avoid duplication of all domain options in the
rule for application section.
It would be could to enhance the validators in libini to allow
something like 'include' section in order to avoid this issue
in the future.
Resolves:
https://pagure.io/SSSD/sssd/issue/3356
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>