Updating scripts used to build k8s upgrade patches to handle
current kubernetes version (1.18.1). My previous commit
missed changes to the preapply/preremove scripts.
Change-Id: I70b2796f625ac79df1de08e4e802d70e3e33d36a
Story: 2006781
Task: 38479
Signed-off-by: Bart Wensley <barton.wensley@windriver.com>