refact(deps): bump k8s and client-go deps to version v0.20.2 (#294)

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

vendor/github.com/openebs/lib-csi/pkg/common/helpers/helpers.go

@@ -17,7 +17,10 @@ limitations under the License.
 package helpers
 
 import (
+	"os"
 	"strings"
+
+	"github.com/google/uuid"
 )
 
 // GetCaseInsensitiveMap coercs the map's keys to lower case, which only works
@@ -43,3 +46,29 @@ func GetInsensitiveParameter(dict *map[string]string, key string) string {
 	insensitiveDict := GetCaseInsensitiveMap(dict)
 	return insensitiveDict[strings.ToLower(key)]
 }
+
+func exists(path string) (os.FileInfo, bool) {
+	info, err := os.Stat(path)
+	if os.IsNotExist(err) {
+		return nil, false
+	}
+	return info, true
+}
+
+// FileExists checks if a file exists and is not a directory
+func FileExists(filepath string) bool {
+	info, present := exists(filepath)
+	return present && info.Mode().IsRegular()
+}
+
+// DirExists checks if a directory exists
+func DirExists(path string) bool {
+	info, present := exists(path)
+	return present && info.IsDir()
+}
+
+// IsValidUUID validates whether a string is a valid UUID
+func IsValidUUID(u string) bool {
+	_, err := uuid.Parse(u)
+	return err == nil
+}