Add a MTU column to the networks table. If set, this will configure the MTU in
DHCP so that nodes will have the correct MTU during provisioning. This is
important for large systems to enable jumbo frames to reduce CPU usage when
copying diskless images over the network (before the confignics postscript can
run to set the desired MTU).
- categorize into topics without "xCAT" in the heading
since the topics are all related to xCAT
- Alphabetize the topics to make it easier to find
- create sub directories for the topics to contain
the documentation
- broke down some of the docs to multiple files to help
ease of readability
