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/lib/redfish_request.py b/lib/redfish_request.py
index da455a3..64463cf 100644
--- a/lib/redfish_request.py
+++ b/lib/redfish_request.py
@@ -383,8 +383,8 @@
 
         'Actions' : {
         '#Manager.Reset' : {
-        '@Redfish.ActionInfo' : '/redfish/v1/Managers/bmc/ResetActionInfo',
-        'target' : '/redfish/v1/Managers/bmc/Actions/Manager.Reset'
+        '@Redfish.ActionInfo' : '/redfish/v1/Managers/${MANAGER_ID}/ResetActionInfo',
+        'target' : '/redfish/v1/Managers/${MANAGER_ID}/Actions/Manager.Reset'
         }
         }
         """