SERVER-10007 better logging for dbclient_rs.cpp
SERVER-10007 compile fail, toString() needed for str::stream()
SERVER-8899 read-lock while updating ShardChunkManager in trySetVersion()
SERVER-9913 protect ScopedDbConn constructor in migrate critical section
SERVER-9714 buildbot auto2.js don't run connpoolsync before gle
SERVER-9934 remove double getmore when pulling new ops

This reduces the potential delay in ending the bgsync thread from 10 seconds
to 5 seconds.  This is important because assumingPrimaryness waits on this loop
before changing state to PRIMARY after an election.
To reduce the delay lower than 5 seconds requires further redesign of the code.
SERVER-10135 sort1.js turn off balancer for manual chunk moves
SERVER-10137 sort1.js can't use sh.stopBalancer without a db