The sysctl cookbook changed upstream; pin to version 0.3.5 until issues around ruby_block[save-sysctl-params] are  resolved in BCPC
Clean-up nn_txn handling and enable Journal Node additions and rebuilds
Set cookbook default for HDFS replication to 3; set Test-Laptop HDFS replication to more laptop-able 1
Ensure cluster-assign-roles.sh only knife bootstraps when necessary

Conflicts:

	cluster-assign-roles.sh