Merge changes Ifa58dcf6,I96ac1894,I4c333619,I74df9064,I6eced365, ... into stable-2.10
* changes:
Fix LDAP authentication for the RFC2307 server type
Lazily lookup LDAP group memberships
Configurable ldap.fetchMemberOfEagerly to optimize LDAP login
Improve LDAP login times, transfer 40x less data.
Reduce number of LDAP queries when having multiple accountBases
Fix LDAP connection pool configuration.
Improve method and variable names related to group inclusion caches
Honor ldap.connectTimeout also without connection pooling