Set system, chassis, and bmc as global variables

Changes:
  - Add SYSTEM_ID as a global variable and set to default value system
  - Replace redfish/v1/Systems/system to redfish/v1/Systems/SYSTEM_ID
  - Replace redfish/v1/Chassis/chassis to redfish/v1/Chassis/CHASSIS_ID
  - Replace redfish/v1/Managers/bmc to redfish/v1/Managers/MANAGER_ID

Tested:
  - Tested on sandbox with the changes with sample test run with
    sample test ID runs
    1. without SYSTEM_ID provided
    2. with -v SYSTEM_ID:system1
    3. with export SYSTEM_ID=""
    3. with export SYSTEM_ID="system2"

Change-Id: Ifc412b20038cef1eba632caaa6c300be328259bd
Signed-off-by: Wilson Suen <wilsons@supermicro.com>
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/bmc_redfish_utils.robot b/lib/bmc_redfish_utils.robot
index a9ca187..c8e9ac4 100644
--- a/lib/bmc_redfish_utils.robot
+++ b/lib/bmc_redfish_utils.robot
@@ -32,7 +32,7 @@
     #  }
     # }
 
-    ${target}=  redfish_utils.Get Target Actions  /redfish/v1/Systems/system/  ComputerSystem.Reset
+    ${target}=  redfish_utils.Get Target Actions  /redfish/v1/Systems/${SYSTEM_ID}/  ComputerSystem.Reset
     ${payload}=  Create Dictionary  ResetType=${reset_type}
     ${resp}=  Redfish.Post  ${target}  body=&{payload}
     ...  valid_status_codes=[${HTTP_OK}, ${HTTP_NO_CONTENT}]
@@ -60,7 +60,7 @@
 Reset BIOS Via Redfish
     [Documentation]  Do BIOS reset through Redfish.
 
-    ${target}=  redfish_utils.Get Target Actions  /redfish/v1/Systems/system/Bios/  Bios.ResetBios
+    ${target}=  redfish_utils.Get Target Actions  /redfish/v1/Systems/${SYSTEM_ID}/Bios/  Bios.ResetBios
     Redfish.Post  ${target}  valid_status_codes=[${HTTP_OK}]
 
 
@@ -173,7 +173,7 @@
     # fru_type  The type of fru (e.g. "Processors", "Memory", etc.).
 
     ${fru_records}=  Redfish_Utils.Enumerate Request
-    ...  /redfish/v1/Systems/system/${fru_type}  return_json=0
+    ...  /redfish/v1/Systems/${SYSTEM_ID}/${fru_type}  return_json=0
     ${fru_records}=  Filter Struct  ${fru_records}  [('State', 'Enabled'), ('Health', 'OK')]
 
     [Return]  ${fru_records}