Add option to skip code update if image is already on the BMC

Resolves openbmc/openbmc-test-automation#1008

Change-Id: I87764de485bb9d78918b8f44b486a175a34dea55
Signed-off-by: Charles Paul Hofer <Charles.Hofer@ibm.com>
diff --git a/extended/code_update/bmc_code_update.robot b/extended/code_update/bmc_code_update.robot
index 99be4ef..f9e0b15 100644
--- a/extended/code_update/bmc_code_update.robot
+++ b/extended/code_update/bmc_code_update.robot
@@ -19,6 +19,7 @@
 ${QUIET}                          ${1}
 ${IMAGE_FILE_PATH}                ${EMPTY}
 ${ALTERNATE_IMAGE_FILE_PATH}      ${EMPTY}
+${SKIP_UPDATE_IF_ACTIVE}          false
 
 *** Test Cases ***
 
@@ -27,7 +28,7 @@
     [Tags]  REST_BMC_Code_Update
     [Setup]  Code Update Setup
 
-    Upload And Activate Image  ${IMAGE_FILE_PATH}
+    Upload And Activate Image  ${IMAGE_FILE_PATH}  ${SKIP_UPDATE_IF_ACTIVE}
     OBMC Reboot (off)