Merge branch 'optimize_ldap' into 'master'
Optimize LDAP and add a search timeout Related to #4282 This merge request arranges some things in `access.rb` to facilitate some optimizations in EE (to come later). It also adds a 10 second timeout to all LDAP searches so the entire worker is not blocked if some query doesn't return in a reasonable amount of time. This timeout is configurable per LDAP server. See merge request !2267
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