SERVER-11192 hook c++ driver to transmit mongos authenticated users to mongod, for auditing

Also, add UserNameIterator as a parallel to RoleIterator.
SERVER-11144 Change new config file option structure
SERVER-11814 Add function to parse ISO Date to time utils
SERVER-11814 fix include path fix
SERVER-11814 Fix overflow on 32 bit systems
Merge remote-tracking branch 'upstream/master'