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/open_power_utils.robot b/lib/open_power_utils.robot
index 344590b..21a0901 100644
--- a/lib/open_power_utils.robot
+++ b/lib/open_power_utils.robot
@@ -83,7 +83,7 @@
 Get Functional Processor Count
     [Documentation]  Get functional processor count.
 
-    ${cpu_list}=  Redfish.Get Members List  /redfish/v1/Systems/system/Processors/  *cpu*
+    ${cpu_list}=  Redfish.Get Members List  /redfish/v1/Systems/${SYSTEM_ID}/Processors/  *cpu*
 
     FOR  ${endpoint_path}  IN  @{cpu_list}
        # {'Health': 'OK', 'State': 'Enabled'} get only matching status good.
@@ -98,7 +98,7 @@
 Get Active OCC State Count
     [Documentation]  Get active OCC state count.
 
-    ${cpu_list}=  Redfish.Get Members List  /redfish/v1/Systems/system/Processors/  *cpu*
+    ${cpu_list}=  Redfish.Get Members List  /redfish/v1/Systems/${SYSTEM_ID}/Processors/  *cpu*
 
     FOR  ${endpoint_path}  IN  @{cpu_list}
        ${num}=  Set Variable  ${endpoint_path[-1]}
@@ -150,7 +150,7 @@
     #  /redfish/v1/Systems/system/Processors/cpu0
     #  /redfish/v1/Systems/system/Processors/cpu1
 
-    ${cpu_list}=  Redfish.Get Members List  /redfish/v1/Systems/system/Processors/  cpu*
+    ${cpu_list}=  Redfish.Get Members List  /redfish/v1/Systems/${SYSTEM_ID}/Processors/  cpu*
 
     FOR  ${endpoint_path}  IN  @{cpu_list}
        # {'Health': 'OK', 'State': 'Enabled'} get only matching status good.