Accept olt_config file as a separate argument to cord-tester or to manifest.
Change all tests to use OLT_CONFIG_FILE environment as appropriate.
Add a manifest file for voltha scenario that can test AAA/TLS with voltha and access side ONOS.

Change-Id: I6af70cd38d9b14187790dea7011839b8ba614432
diff --git a/src/test/setup/manifest-olt-voltha.json b/src/test/setup/manifest-olt-voltha.json
new file mode 100644
index 0000000..276e480
--- /dev/null
+++ b/src/test/setup/manifest-olt-voltha.json
@@ -0,0 +1,12 @@
+{
+    "onos_instances": 1,
+    "olt": true,
+    "olt_config" : "olt_config_voltha.json",
+    "start_switch": false,
+    "onos" : "10.70.46.93",
+    "radius" : "172.23.0.3",
+    "onos_image": "onosproject/onos:latest",
+    "log_level" : "INFO",
+    "jvm_heap_size" : "1G",
+    "karaf_version" : "3.0.5"
+}