Resolve "The mechanism to watch devices during controller start currently only supports watching the same path for each device"

Description

Related Issue

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.

Related to #235

controller/nucleus/networkElementWatcher.go

@@ -216,22 +216,7 @@ func (n *NetworkElementWatcher) handleSubscribeResponseUpdate(resp *gpb.Subscrib
 // Paths should be provided in the following format [][]string{{"system", "config", "hostname"}}.
 func (n *NetworkElementWatcher) mergeGnmiSubscriptions(gNMISusbcriptionPathsFromMne, gNMISusbcriptionPathsFromConfig [][]string) [][]string {
 	// create slice with all elements
-	var tempJoinedPaths = gNMISusbcriptionPathsFromMne
-
-	for _, configPath := range gNMISusbcriptionPathsFromConfig {
-		tempJoinedPaths = append(tempJoinedPaths, configPath)
-	}
-
-	// sort slice
-	sort.Slice(tempJoinedPaths[:], func(i, j int) bool {
-		for elem := range tempJoinedPaths[i] {
-			if tempJoinedPaths[i][elem] == tempJoinedPaths[j][elem] {
-				continue
-			}
-			return tempJoinedPaths[i][elem] < tempJoinedPaths[j][elem]
-		}
-		return false
-	})
+	var tempJoinedPaths = append(gNMISusbcriptionPathsFromMne, gNMISusbcriptionPathsFromConfig...)
 
 	// remove duplicates
 	inResult := make(map[string]bool)
@@ -245,4 +230,5 @@ func (n *NetworkElementWatcher) mergeGnmiSubscriptions(gNMISusbcriptionPathsFrom
 	}
 
 	return joinedPaths
+
 }