Open firewall for DNS on both TCP and UDP

nsupdate uses UDP by default unless the request is too large.  Open DNS to both
TCP and UDP rather than just TCP.
handle arm architecture for yum repos
Fix IPTables rules for node proxy
Start cgconfig and cgred services on node
Install vim, mlocate, screen on nodes
Merge pull request #131 from kraman/bugfix

Various minor bug fixes
Merge pull request #130 from maxamillion/admiller/add_arch_config

handle arm architecture for yum repos
Merge pull request #123 from charlessimpson/named-firewall

Open firewall for DNS on both TCP and UDP