SERVER-15868 SERVER-15655 Better handling of receiving an invalid config via a heartbeat
SERVER-15868 SERVER-15665 Add required arg to _getHbmsg
SERVER-15898 yielding impl checks for interrupt even if doc-level locking is supported
SERVER-15896 Rename variable to avoid coverity warning from hiding function parameter
SERVER-13951 pass false to invalidateAll() when dropping collection

true should only be passed from the CollectionCursorCache destructor.
SERVER-15900: secondaries should stripe writes by doc if doc locking is on
SERVER-13635: add isDurable to StorageEngine and use for GLE
Merge remote-tracking branch 'nextdoor/master'