Fix sharding/authCommands.js test by not asking for a numeric write concern when doing a write to config servers
Remove auth_copydb2.js from list of serial tests for parallel suite
SERVER-10026 continue to address QUERY_MIGRATION tests

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
SERVER-5470 extended plan cache to hold all solutons from planning process
Merge remote-tracking branch 'upstream/master'