Update cluster-assign-roles.sh to assign arbitrary head node and work node roles
Update cluster-assign-roles.sh to support iterative cluster building (OpenStack install type) or describe-first cluster building (Hadoop install type)
Create a bootstrap-miscellaneous recipe (nodessh.sh needs sshpass)
Remove deb-src apt lines in chefit.sh as otherwise apt-get update will return non-zero since our scripts do not mirror deb-src repos