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/network/test_bmc_dhcp_conf.robot b/network/test_bmc_dhcp_conf.robot
index f5c13a5..48fc6d0 100644
--- a/network/test_bmc_dhcp_conf.robot
+++ b/network/test_bmc_dhcp_conf.robot
@@ -117,11 +117,11 @@
 
     ${active_channel_config}=  Get Active Channel Config
     Redfish.Patch
-    ...  /redfish/v1/Managers/bmc/EthernetInterfaces/${active_channel_config['${CHANNEL_NUMBER}']['name']}/
+    ...  /redfish/v1/Managers/${MANAGER_ID}/EthernetInterfaces/${active_channel_config['${CHANNEL_NUMBER}']['name']}/
     ...  body={"DHCPv4":${property}}  valid_status_codes=[${HTTP_OK}, ${HTTP_NO_CONTENT}]
 
     ${resp}=  Redfish.Get
-    ...  /redfish/v1/Managers/bmc/EthernetInterfaces/${active_channel_config['${CHANNEL_NUMBER}']['name']}
+    ...  /redfish/v1/Managers/${MANAGER_ID}/EthernetInterfaces/${active_channel_config['${CHANNEL_NUMBER}']['name']}
     Verify Ethernet Config Property  ${property}  ${resp.dict["DHCPv4"]}