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/lib/resource.txt b/lib/resource.txt
index 6a3690d..34db7a0 100755
--- a/lib/resource.txt
+++ b/lib/resource.txt
@@ -56,6 +56,7 @@
 ${PNOR_IMAGE_FILE_PATH}         ${EMPTY}
 ${BMC_IMAGE_FILE_PATH}          ${EMPTY}
 ${BAD_IMAGES_DIR_PATH}          ${EMPTY}
+${SKIP_UPDATE_IF_ACTIVE}        false
 
 # The caller must set this to the string "true" in order to delete images. The
 # code is picky.