Ockam enroll should work without having to specify the node or Ockam Controller URL

[BeenzSyed]

Ockam enroll enrolls the identity of a node to the Ockam Orchestrator. It should work without having to specify the node as an argument or the Controller URL.

Current behavior

ockam enroll --auth0 $CONTROLLER -n blue

$CONTROLLER will be hard coded into the Ockam Command binary and the identity of the node will be a global known identity so both of those values can be derived and do not need to be specified by the user.

Desired behavior

ockam enroll --auth0