AD_PROVIDER: ad_enabled_domains - other then master
We can skip looking up other domains if
option ad_enabled_domains doesn't contain them.
Resolves:
https://fedorahosted.org/sssd/ticket/2828
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>