Re-implement app-related commands in skywire-cli and manager-node.

[evanlinjin]

Branch: mainnet-dev

Background

After the separation of the proc and app concepts (Where a proc is an instance of a running app), the interfaces; node.RPC and node.RPCClient (as well as their implementations) need an update. And consequently, also the endpoints of manager.Node and skywire-cli.

Tasks

• Replace the commented out methods of node.RPC/node.RPCClient with the following methods:

  • Apps() []app.Meta obtains all available apps.
  • StartProc(appName string, args []string, port uint16) (router.ProcID, error) runs a proc.
  • StopProc(pid router.ProcID) error stops a proc.
  • ListProcs() []router.ProcInfo lists all running procs. Note that ProcInfo is not implemented; it should be a combination of router.ProcID ,app.Meta and app.ExecConfig.

• Write sub-commands for the aforementioned calls in skywire-cli.

• Write endpoints for the aforementioned calls in manager.Node.