Current LDAP issue prioritization (meta)

Meta issue to list and prioritize all current LDAP bugs or feature requests.

cc/ @JobV @DouweM @jacobvosmaer-gitlab

The top issues related to LDAP (in my mind) are those below. I listed them in order of my perceived priority.

• Allow LDAPGroupSync to accept a group name/id to sync individually ~"feature proposal" Blocks https://gitlab.com/gitlab-org/gitlab-ee/issues/400 (next item)
• Change LDAP group sync 'Clear cache' to 'Sync now' ~"feature proposal"
• Seek alternative to AD recursive filter search ~"bug"
• Allow option to change permission levels of users when LDAP group sync is enabled ~"feature proposal" customer
• Avoid spurious ldap_blocked issues ~"bug"
• Improve error message when LDAP user is outside filter ~bug customer
• LDAP multi-domain group sync support ~"feature proposal" customer
• Add compound group sync filter ~"feature proposal" customer
• Implement group_filter for group sync ~"feature proposal" customer