AD: Missing header in ad_access.h ad_access.h depends on data_provider.h header but does not include it. Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

DP: Switch to new interface Reviewed-by: Sumit Bose <sbose@redhat.com> Reviewed-by: Jakub Hrozek <jhrozek@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

AD-GPO: processing changes for gpo_map_* options Reviewed-by: Sumit Bose <sbose@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

AD-GPO: add ad_gpo_cache_timeout option Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

Implemented LDAP component of GPO-based access control Reviewed-by: Sumit Bose <sbose@redhat.com> Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

AD: Add a utility function to create list of connections ad_id.c and ad_access.c used the same block of code. With the upcoming option to disable GC lookups, we should unify the code in a function to avoid breaking one of the code paths. The same applies for the LDAP connection to the trusted AD DC. Includes a unit test.

AD: Search GC by default during access control, fall back to LDAP Resolves: https://fedorahosted.org/sssd/ticket/2082 In order to allow the ad_access_filter option to work for subdomain users as well, the Global Catalog must be searched. This patch adds a wrapper request atop sdap_access_send that selects the right connection (GC or LDAP) and optionally falls back to LDAP.

AD: Add AD access-control provider This patch adds support for checking whether a user is expired or disabled in AD.