Dont fail if were missing setfiles

We are using which to find the location of setfiles. Our script is set
-e though, and we need to also be able to handle the case where setfiles
does not exist (like on centos-minimal).

Change-Id: If53c7a80efc081b95b143c28be64d39b12bfb469

elements/rpm-distro/finalise.d/11-selinux-fixfiles-restore

@@ -5,7 +5,7 @@ if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
 fi
 set -eu
 set -o pipefail
-SETFILES=$(which setfiles)
+SETFILES=$(which setfiles || true)
 if [ -e /etc/selinux/targeted/contexts/files/file_contexts -a -x "${SETFILES}" ]; then
     # Without fixing selinux file labels, sshd will run in the kernel_t domain
     # instead of the sshd_t domain, making ssh connections fail with