Improvement: Remove Magic Numbers in Tests with Tasks

Replaced 2 with TASK_SUCCEEDED, 3 with TASK_FAILED.

fixes: #1158

system/api_lib.py

@@ -1,17 +1,22 @@
-from lib import BaseTest
-import time
-import json
-import random
-import string
-import os
 import inspect
+import json
+import os
+import random
 import shutil
+import string
+import time
+
+from lib import BaseTest
 
 try:
     import requests
 except ImportError:
     requests = None
 
+# States for returned tasks from the API
+TASK_SUCCEEDED = 2
+TASK_FAILED = 3
+
 
 class APITest(BaseTest):
     """