SERVER-11502 Moved OpenSSL multithreading callbacks
SERVER-11507 drop(User|Role)sFromDatabase renamed to dropAll(User|Role)sFromDatabase
SERVER-9516 Legalize admin.system.new_users and admin.system.backup_users collections.
SERVER-11499 Fix dumprestore5.js by counting indexes only on collection of interest.
SERVER-11501 SERVER-2212 Fix deref. of invalidated iterator