More log data in LDAPLock.acquire() and LDAPLock.release()
* LDAPObject and friends now pass `desc' to ldap.LDAPLock() which
  results in better logging
* ldapobject.ReconnectLDAPObject now uses internal class-wide
  lock for serializing reconnects
* Method signature of ReconnectLDAPObject.reconnect() changed to be able
  to call it with separate retry_max and retry_delay values
Release 2.4.14 now
Cleaned up reconnect logging a bit