Sledctl ping/run + cogs nodestate
Added a section in the cogs with a diagram that illistrates some of the state that is tied to the cogs and sled and how they interplay with each other.
Also added a debugging section to cover the main/largest issues with sled/cogs in the wild, as well as using sledctl ping and run.
Signed-off-by: Lincoln Thurlow lincoln@isi.edu