SERVER-15429 Prepare applier threads to be started by the ReplicationCoordinatorImpl
SERVER-15429 Finish making background sync thread capable of running under the new replication coordinator
SERVER-15429 Make ReplicationCoordinatorImpl capable of starting the applier threads
SERVER-15386 Let writeAuthSchemaVersionIfNeeded set schemaVersion28SCRAM
SERVER-15465 Fixed OpenSSL intermittent crash on stepdown

Corresponding to 0e6d61d465bbe8679f29339eee20b7ad9aec295e
in the v2.6 branch.
SERVER-15441 Prevent user management shell helpers from accessing "db" global
Merge remote-tracking branch 'upstream/master'