SERVER-15639 Correctly handle >1 pred on same text index prefix field
SERVER-13635: don't run dur_remove_old_journals.js on 32-bit platforms
SERVER-15535 Make all calls to exitCleanly but the first hang forever.

Some components, notably the replication coordinator, cannot be shutdown
repeatedly, but also may not be shutdown while holding the global exclusive
lock.  With this change, only one call to exitCleanly will proceed to
completion; all others will spin in a long sleep loop, neither returning nor
engaging in shut down tasks.
SERVER-15535 Wait for secondary to start and replicate in jstests/replsets/initSyncV1Index.js
SERVER-15535 revert freshness changes w.r.t. priority
SERVER-15535 update slavemap optimes on heartbeats
SERVER-15647: make Extent Manager thread-safe and enable MMAPv1 CLL
SERVER-15244 More aggressive auto-split when total chunks are small
SERVER-15506 batch_write_commands tests generate too much output
SERVER-14668: Use server parameter to enable CLL

This does not affect storage engines that support document level locking.
SERVER-15535 adjust resync command handling synchronization
SERVER-15535 fix server6733.js to connect to a new sync source
SERVER-15695 disable flawed test
SERVER-15535 add arbiter to make shutdown test work
SERVER-15535 Do not immediately stand for reelection after stepping down for a higher priority node.
SERVER-13635: pass whether an index is unique or not down through SortedDataInterface
SERVER-13635: better txn lines for replication sync
SERVER-15683: add command to introspect OperationContext and RecoveryUnit
SERVER-13635: make test handle oplogs of different engines
SERVER-13635: txn boundary for chunk migration getting disk locs