SERVER-15057 fix one potential deadlock in rocks storage when dropping database

Closes #760

Signed-off-by: Benety Goh <benety@mongodb.com>
SERVER-14668 Extend the LockManager API and add comments

o Adds downgrade call for the lock manager, which will soon be necessary
for the Flush lock and also for document-level locking.

o Adds timeout parameter for lock grant to occur.

o Adds comments where they were missing before.
 SERVER-14805: initialsync multithreaded oplog apply
Fix fassert code collision.
SERVER-14444 Remove stepDownAndWaitForSecondary from ReplicationCoordinator
SERVER-14440 Bundle openssl with SSL targeted Windows MSI
Merge remote-tracking branch 'upstream/master'