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/ipmi/test_ipmi_general.robot b/ipmi/test_ipmi_general.robot
index 924147a..8995df9 100644
--- a/ipmi/test_ipmi_general.robot
+++ b/ipmi/test_ipmi_general.robot
@@ -30,7 +30,7 @@
     [Tags]  Test_Get_Device_GUID_Via_IPMI_Raw_Command
     [Teardown]  Run Keywords  Redfish.Logout  AND  FFDC On Test Case Fail
     # Get GUIDS via IPMI.
-    # This should match the /redfish/v1/Managers/bmc's UUID data.
+    # This should match the /redfish/v1/Managers/${MANAGER_ID}'s UUID data.
     ${guids}=  Run IPMI Standard Command  raw ${IPMI_RAW_CMD['Device GUID']['Get'][0]}
     # Reverse the order and remove space delims.
     ${guids}=  Split String  ${guids}
@@ -38,7 +38,7 @@
     ${guids}=  Evaluate  "".join(${guids})
 
     Redfish.Login
-    ${uuid}=  Redfish.Get Attribute  /redfish/v1/Managers/bmc  UUID
+    ${uuid}=  Redfish.Get Attribute  /redfish/v1/Managers/${MANAGER_ID}  UUID
     ${uuid}=  Remove String  ${uuid}  -
 
     Rprint Vars  guids  uuid