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_test.go

@@ -384,7 +384,7 @@ func TestPndAdapter_PendingChanges(t *testing.T) {
 				id:       tt.fields.id,
 				endpoint: tt.fields.endpoint,
 			}
-			if got := p.PendingChanges(); !reflect.DeepEqual(got, tt.want) {
+			if got, _ := p.PendingChanges(); !reflect.DeepEqual(got, tt.want) {
 				t.Errorf("PndAdapter.PendingChanges() = %v, want %v", got, tt.want)
 			}
 		})
@@ -409,7 +409,7 @@ func TestPndAdapter_CommittedChanges(t *testing.T) {
 				id:       tt.fields.id,
 				endpoint: tt.fields.endpoint,
 			}
-			if got := p.CommittedChanges(); !reflect.DeepEqual(got, tt.want) {
+			if got, _ := p.CommittedChanges(); !reflect.DeepEqual(got, tt.want) {
 				t.Errorf("PndAdapter.CommittedChanges() = %v, want %v", got, tt.want)
 			}
 		})