Improve usability and better output formatting for gosndc

Description

Related Issue

#188 (closed)

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

cli/adapter/PndAdapter.go

@@ -119,7 +119,7 @@ func (p *PndAdapter) ChangeOND(duid uuid.UUID, operation ppb.ApiOperation, path
 
 // Request sends an API call to the controller requesting the specified path
 // for the specified device
-func (p *PndAdapter) Request(did uuid.UUID, path string) (proto.Message, error) {
+func (p *PndAdapter) Request(did uuid.UUID, path string) (*ppb.GetPathResponse, error) {
 	resp, err := api.GetPath(p.endpoint, p.id.String(), did.String(), path)
 	if err != nil {
 		return nil, err