Managers ID : Introduced variable to declare Managers ID in resource.robot and updated all the scripts in openbmc-test-automation

Changes:
    - Introduced ${MANAGER_ID} variable in resource.robot
    - Replaced all the Managers/bmc to Managers/${MANAGER_ID} across all the scripts
    - Also in data/variables.py updated chassis id for the few redfish uri.

Tested:
     - Ran All The Scripts Successfully

Change-Id: Iff3673aae27657e0799dec5cb94c1651a0cd5d18
Signed-off-by: ganesanb <ganesanb@ami.com>
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/task_service/test_tasks.robot b/redfish/task_service/test_tasks.robot
index 2b5d7ad..f4559ec 100644
--- a/redfish/task_service/test_tasks.robot
+++ b/redfish/task_service/test_tasks.robot
@@ -103,7 +103,7 @@
     #         ],
     #         "HttpOperation": "POST",
     #         "JsonBody": "{\n  \"DiagnosticDataType\": \"Manager\"\n}",
-    #         "TargetUri": "/redfish/v1/Managers/bmc/LogServices/Dump/Actions
+    #         "TargetUri": "/redfish/v1/Managers/${MANAGER_ID}/LogServices/Dump/Actions
     #                      /LogService.CollectDiagnosticData"
     #     },
     #     "PercentComplete": 0,