Fixed mock json response of instance data

cloudbridge/cloud/providers/aws/provider.py

@@ -172,7 +172,7 @@ class MockAWSCloudProvider(AWSCloudProvider, TestMockHelperMixin):
         HTTPretty.register_uri(
             method="GET",
             uri="https://d168wakzal7fp0.cloudfront.net/aws_instance_data.json",
-            body="""
+            body=u"""
 [
   {
     "family": "General Purpose",
@@ -196,13 +196,12 @@ class MockAWSCloudProvider(AWSCloudProvider, TestMockHelperMixin):
     "storage": null,
     "max_bandwidth": 0,
     "instance_type": "t2.nano",
-    "ECU": "variable,
+    "ECU": "variable",
     "memory": 0.5,
     "ebs_max_bandwidth": 0
   }
 ]
-"""
-        )
+""")
 
     def tearDownMock(self):
         """