Resolve "Exiting gosdnc causes the input in cli to be invisble"

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 #317

cli/cmd/prompt.go

@@ -33,6 +33,7 @@ package cmd
 
 import (
 	"os"
+	"os/exec"
 	"strings"
 
 	"code.fbi.h-da.de/danet/gosdn/cli/completer"
@@ -42,6 +43,7 @@ import (
 	"github.com/openconfig/goyang/pkg/yang"
 	"github.com/pterm/pterm"
 	"github.com/pterm/pterm/putils"
+	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"github.com/spf13/viper"
@@ -386,8 +388,16 @@ var exitCmd = &cobra.Command{
 	Long:  `The exit command exits the interactive prompt mode.`,
 
 	RunE: func(cmd *cobra.Command, args []string) error {
-		os.Exit(0)
+		rawModeOff := exec.Command("/bin/stty", "-raw", "echo")
+		rawModeOff.Stdin = os.Stdin
 
+		err := rawModeOff.Run()
+		if err != nil {
+			logrus.Error(err)
+			os.Exit(1)
+		}
+
+		os.Exit(0)
 		return nil
 	},
 }