packaging: setup: remove pki artifacts on failure

the existence of pki files, especially ca.pem marks a valid pki
configuration.

if we fail installation we should also revert pki, however since we do
not have a method of reverting pki artifacts (legacy), we can just
remove these for now when failure is detected.

Change-Id: I1de80122a3d5894009319e9418733e444ed7fe9c
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>