SERVER-12275 add MaxWriteBatchSize to isMaster
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
SERVER-10026 check for comparison match expressions with regex during parsing