Add num iterations of test to manifest file that can be used by the test from ITERATIONS environment if required

Change-Id: Ie6193d0b750f59f2674e0659eeef1ffda94831ef
diff --git a/src/test/utils/TestManifest.py b/src/test/utils/TestManifest.py
index b8ca881..b56300d 100644
--- a/src/test/utils/TestManifest.py
+++ b/src/test/utils/TestManifest.py
@@ -35,6 +35,7 @@
             self.start_switch = args.start_switch
             self.image_prefix = args.prefix
             self.onos_image = args.onos
+            self.iterations = None
             self.server = '{}:{}'.format(CORD_TEST_HOST, CORD_TEST_PORT)
         else:
             with open(self.manifest, 'r') as fd:
@@ -51,3 +52,4 @@
             self.image_prefix = data.get('image_prefix', '')
             self.onos_image = data.get('onos_image', 'onosproject/onos:latest')
             self.server = data.get('test_server', '{}:{}'.format(CORD_TEST_HOST, CORD_TEST_PORT))
+            self.iterations = data.get('iterations', None)