check graph facility of TEN manager

[halajohn]

• When checking the graph, ensure to follow the app URI rules for both 1-app and n-apps
  • If it is a "single" app, the app URI "must" be completely omitted, and both the TEN runtime and tman will default to using localhost for everything.
  • If it is a "multi" app, the app URI cannot be omitted in any way. Each graph node must specify the app URI, and it "cannot" be localhost.
• Add a check to prevent duplicate items with the same msg_name.
• This facility can also be placed in the minimal version, and runtime can check it as well.