Make a common Server Node file #694

Right now there is a separate node file for SLES and Redhat but there is alot of commonality in each. It's worthwhile to try to consolidate these files as much as possible, and leave the OS specific lines in their own file. This has been partly accomplished in /common/src/node files like frontend-server.xml and dhcp-server.xml but there is still alot of places the node files could be joined together between SLES and Redhat vs being in their own folders.