SERVER-13368: Expose microsecs_running in currentOp
Revert "SERVER-13601 assert upon failing to run a replicated command"

This reverts commit 3f9e1b02bf10124dba4e264fe1485a39942db9aa.
SERVER-11332 minor cleanup of SCC and chunk diff timeout
SERVER-13615 sharding_rs2.js intermittent failure due to reliance on opcounters
Merge remote-tracking branch 'upstream/master'