Support to enable VOLTHA in cord-tester.
VOLTHA can now be started by cord-tester by specifying voltha_loc in manifest file.
voltha_intf specifies the interface for voltha to listen.
A sample manifest-voltha.json can be modified accordingly before starting cord-tester.
Changed the default olt_type to simulated_olt in volthaTest configuration json.
This would enable testing of voltha tests.
Fix indentation broken in voltha tests earlier.

Change-Id: Ia18b870c83dcb60c15c07f8602579494f32457c9
diff --git a/src/test/utils/TestManifest.py b/src/test/utils/TestManifest.py
index bdd66c7..26c5130 100644
--- a/src/test/utils/TestManifest.py
+++ b/src/test/utils/TestManifest.py
@@ -50,6 +50,8 @@
             self.server = args.server
             self.jvm_heap_size = args.jvm_heap_size if args.jvm_heap_size else None
             self.karaf_version = args.karaf
+            self.voltha_loc = args.voltha_loc
+            self.voltha_intf = args.voltha_intf
         else:
             with open(self.manifest, 'r') as fd:
                 data = json.load(fd)
@@ -76,3 +78,5 @@
             self.iterations = data.get('iterations', None)
             self.jvm_heap_size = data.get('jvm_heap_size', None)
             self.karaf_version = data.get('karaf_version', '3.0.8')
+            self.voltha_loc = data.get('voltha_loc', '')
+            self.voltha_intf = data.get('voltha_intf', 'eth0')