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/update_service/test_bmc_image_switch.robot b/redfish/update_service/test_bmc_image_switch.robot
index 26ee0e5..9904334 100755
--- a/redfish/update_service/test_bmc_image_switch.robot
+++ b/redfish/update_service/test_bmc_image_switch.robot
@@ -110,14 +110,14 @@
 
 Match BMC Release And Redifsh Firmware Version
     [Documentation]  The /etc/os-release vs Redfish FirmwareVersion attribute value from
-    ...             /redfish/v1/Managers/bmc should match.
+    ...             /redfish/v1/Managers/${MANAGER_ID} should match.
 
     # Python module: get_bmc_release_info()
     ${bmc_release_info}=  utils.Get BMC Release Info
     ${bmc_release}=  Set Variable  ${bmc_release_info['version_id']}
     Rprint Vars  bmc_release
 
-    ${firmware_version}=  Redfish.Get Attribute  /redfish/v1/Managers/bmc  FirmwareVersion
+    ${firmware_version}=  Redfish.Get Attribute  /redfish/v1/Managers/${MANAGER_ID}  FirmwareVersion
     Rprint Vars  firmware_version
 
     Should Be Equal As Strings   ${bmc_release}   ${firmware_version}
@@ -139,6 +139,6 @@
     Print Timen  Switch to back up completed.
 
     # Check if the BMC version after rebooted is the same version asked to switch.
-    ${firmware_version}=  Redfish.Get Attribute  /redfish/v1/Managers/bmc  FirmwareVersion
+    ${firmware_version}=  Redfish.Get Attribute  /redfish/v1/Managers/${MANAGER_ID}  FirmwareVersion
     Should Be Equal As Strings   ${image_version}   ${firmware_version}
     ...  msg=${image_version} does not match redfish version ${firmware_version}