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/managers/test_managers_bmc_time.robot b/redfish/managers/test_managers_bmc_time.robot
index eea7496..a9796f9 100644
--- a/redfish/managers/test_managers_bmc_time.robot
+++ b/redfish/managers/test_managers_bmc_time.robot
@@ -201,7 +201,7 @@
 Redfish Get DateTime
     [Documentation]  Returns BMC Datetime value from Redfish.
 
-    ${date_time}=  Redfish.Get Attribute  ${REDFISH_BASE_URI}Managers/bmc  DateTime
+    ${date_time}=  Redfish.Get Attribute  ${REDFISH_BASE_URI}Managers/${MANAGER_ID}  DateTime
     [Return]  ${date_time}
 
 
@@ -225,7 +225,7 @@
     ...  ELSE
     ...  Set Variable  ${date_time}
     Wait Until Keyword Succeeds  1min  5sec
-    ...  Redfish.Patch  ${REDFISH_BASE_URI}Managers/bmc  body={'DateTime': '${date_time}'}  &{kwargs}
+    ...  Redfish.Patch  ${REDFISH_BASE_URI}Managers/${MANAGER_ID}  body={'DateTime': '${date_time}'}  &{kwargs}
 
 
 Set Time To Manual Mode
@@ -312,7 +312,7 @@
     Should Be True  '${time_diff}'<='3'
 
 Verify NTP Servers Are Populated
-    [Documentation]  Redfish GET request /redfish/v1/Managers/bmc/NetworkProtocol response
+    [Documentation]  Redfish GET request /redfish/v1/Managers/${MANAGER_ID}/NetworkProtocol response
     ...              and verify if NTP servers are populated.
 
     ${network_protocol}=  Redfish.Get Properties  ${REDFISH_NW_PROTOCOL_URI}