SERVER-15188 all lastOpTimeWritten setting goes through the legacy repl coord
SERVER-14090: gracefully fail on startup if auth schema version is not 2.6
SERVER-14168 Don't logOp drop of "inc" collection in MR

The creation and inserts into it are not logOp'd so logging the drop lead to
a warning being printed on secondaries.
SERVER-15111 Treat corruption of final journal section as an expected event

This was always the intention of the code, as a crash may happen while
writing the latest journal section. The code wasn't adjusted when we started
preallocating and reusing journal files and when we started compressing
journal sections, so it ended up treating many common types of corruption as
errors.
SERVER-15087 check for dropped collection in MR
SERVER-15087 Get owned copy of document in MR final reduce
SERVER-15146: Use GetSystemTimePreciseAsFileTime where possible
SERVER-15080 Clarify state-changing behavior of TopologyCoordinator and its implementation.

This patch simplifies the state stored in the TopologyCoordinatorImpl, introduces fuller documentary
comments to the interface, checks preconditions, deprecates several methods currently used only in
testing, and generally tries to make the behavior easier to follow.

Methods are introduced for adjusting the maintenance mode count; to allow the applier to move
the node between recovering, rollback, initial sync and secondary states; to handle winning and
losing elections, etc.
SERVER-15080 Move HeartbeatResponseAction and TopologyCoordinator::Role for readability.

HeartbeatResponseAction moves to its own file and becomes a top-level type,
because it is sometimes useful to have its definition without that of
TopologyCoordinator, and because it clutters the TopologyCoordinator class
definition.  TopologyCoordinator::Role gets defined at the end of the
topology_coordinator.h header, so it also does not clutter the
TopologyCoordinator class definition.
SERVER-15080 Fix assert code conflict.
Revert "SERVER-15111 Treat corruption of final journal section as an expected event"

This reverts commit 77b11e686c873ea44e14e6f7419adb24d5f40106.
SERVER-14098 add CountStage
SERVER-14668 Fix the lock manager granting logic
SERVER-7596 Native SCRAM-SHA-1 client/shell implementation
SERVER-15209 remove fassert temporarily
SERVER-14799 hint for a count allows hint to be specified as a document
SERVER-7596 Fixed compile error
SERVER-14668 Move all LockState methods into the Locker class

This change doesn't have any functional effect. Just prepares the
LockState class to be removed.
SERVER-14101 explain for update
SERVER-14977: add new alias for sslWeakCertificateValidation option