nodeinfo should make one file

[pboothe]

It is increasingly obvious that nodeinfo is the right datatype to use. Instead of /var/spool/host/lspci /var/spool/host/iproute, etc, etc, we should just have one datatype nodeinfo and one directory: /var/spool/host/nodeinfo, and that should create a single json file containing the combined output of all the called commands. Something like:

[
  {
    Name: "uname",
    Cmd:      ["uname", "-a"],
    Output: "A big string, possibly multiline"
  },
...
]