node_master should be able to provision workers without network messaging

[godber]

node_master can provision slicers and workers based on something (file or ENV variable) that doesn't rely on network messaging.

[godber]

The node master should use the following environment variables:

• CLUSTER_MANAGER_TYPE - Should be native or kubernetes, it indicates what "mode" the Node master is running in. If the variable is not present, or set to native then it is implied that we are using the original network based node manager activities. If set to kubernetes the node master should get its node type and execution context from the environment variables below.
• NODE_TYPE - Should be slicer or worker. When set to slicer then the node master should create a slicer, when set to worker the node master should create a worker.
• EX - Should be set to the JSON representation of the execution context.

In the kubernetes mode all of these will be set as environment variables in the deployments created by the cluster manager.