Import wiredtiger-wiredtiger-2.4.0-428-gafcc82e.tar.gz from wiredtiger branch mongodb-2.8
SERVER-16197 Update docs/building.md for 2.8
SERVER-16291 allow index filters commands to run on secondaries if slaveOk explicitly set to true
SERVER-16032 SERVER-15957 Get OperationContext for ReplicationCoordinator::signalDrainComplete from the caller
SERVER-15986 SERVER-16283 improve validation to detect mmapv1 local.ns files
SERVER-15986 SERVER-16283 enable storage engine check
SERVER-16252 DBConnectionPool::flush should fully flush connection pool
SERVER-16184 repeated WriteBackListener error on out-of-order upgrade
SERVER-16184 Fix windows
Revert "SERVER-16133 Use RESOURCE_METADATA X lock to set the multiKey index value"

This reverts commit 58e49b2726807b7e7c2f0309607ffa454befbff6.
SERVER-16306 fix primary to node 0 in auth2.js
Merge remote-tracking branch 'upstream/master'