VOL-264: REST Channel ( External REST Client <==> Chameleon) needs to be Secured

These are voltha itest and documentation updates after enforcing a https based
REST server implementation from the chameleon.

The chameleon related changes are already available as part of another review
https://gerrit.opencord.org/#/c/4478/ .

Change-Id: Icd585bb0403524c2e7a0f46fddcf3046876042b4
diff --git a/tests/itests/voltha/test_persistence.py b/tests/itests/voltha/test_persistence.py
index 1111c1e..29b084a 100644
--- a/tests/itests/voltha/test_persistence.py
+++ b/tests/itests/voltha/test_persistence.py
@@ -250,7 +250,7 @@
     def set_rest_endpoint(self):
         self.rest_endpoint = get_endpoint_from_consul(LOCAL_CONSUL,
                                                       'chameleon-rest')
-        self.base_url = 'http://' + self.rest_endpoint
+        self.base_url = 'https://' + self.rest_endpoint
 
     def set_kafka_endpoint(self):
         self.kafka_endpoint = get_endpoint_from_consul(LOCAL_CONSUL, 'kafka')