Revert "SERVER-13643 Use awaitCommit rather than commitNow in migrate"

This reverts commit 96352b10e79c6fee04cd666756889cffcda86113.
SERVER-15965 add test for replset drain mode
SERVER-15695 fix and re-enable rollback_too_new.js + slight unittest enhancement
SERVER-15953: add wiredtiger to third_party
SERVER-15953: add wiredtiger storage engine integration
SERVER-15935 Check return value of setFollowerMode everywhere
SERVER-15966 Make initial_sync3.js deterministic about who becomes primary
SERVER-15967 Increase timeout in get_last_error.js test to allow a secondary to replicate the write
SERVER-15968: Fix snapshot1.js for WT & Windows
SERVER-15954: MongoDB 2.7.8 fails to compile on FreeBSD 10
SERVER-15970 --durOptions was not working
Revert "SERVER-13635: fix rollback of collection create in kv engine"

This reverts commit ab7a1d27f130d0f920651181eafe19316c247b13.
SERVER-15971 fix mongod --help format when wiredtiger enabled
SERVER-15971 wiredtiger options should not precede general options
initialize member variable
SERVER-15882 Get rid of ensureIndex in dbtests.
SERVER-15882 Route inserts to system.indexes through the createIndexes command processor.
SERVER-15541 Move yield.cpp out of the LockManager library and fix warning

Yielding should be should be part of the query library. Also rename the
Yield class in order to avoid warning on Windows.
SERVER-11005 Re-enable FIPS test
Initial update-vendor-wiredtiger script