SERVER-13641 split out dur from transactionexperiment part 1
SERVER-13641 fix build by fixing dummy record store/txn
SERVER-13948 improve stability of replsettest.awaitReplication() while getting the config version from master
SERVER-13930 Don't hardcode "$mod" in error message

Signed-off-by: Benety Goh <benety@mongodb.com>
SERVER-13641 rename TransactionExperiment to  OperationContext
SERVER-13741 Migrate remaining tests to use write commands
fix
SERVER-13385 relax merge chunk constraints
Merge remote-tracking branch 'upstream/master'