Make Cassandra port configurable.

SDC-BE & Onboarding - BE.
Reviewer: Evgenia A & Areli F.

Change-Id: Iaf86d647b0560764ef65d9148c85bffaf934992d
Issue-ID: SDC-2077
Signed-off-by: Tal Gitelman <tal.gitelman@att.com>
diff --git a/sdc-os-chef/environments/Template.json b/sdc-os-chef/environments/Template.json
index 57834c4..3fee2a2 100644
--- a/sdc-os-chef/environments/Template.json
+++ b/sdc-os-chef/environments/Template.json
@@ -71,6 +71,7 @@
         },
 
         "cassandra": {
+            "cassandra_port": 9042,
             "concurrent_reads": "32",
             "num_tokens": "256",
             "data_dir": "/var/lib/cassandra/data",