adding fixtures and unit test cases for issue: #1944

Author: Ramkishor Chaladi

SoftLayer/fixtures/SoftLayer_Network_Storage.py

@@ -262,4 +262,4 @@
     'activeConversionStartTime': '2023-01-01',
     'deDuplicateConversionPercentage': 50,
     'volumeUsername': 'testUser'
-}
+}