opensuse: tail the zypper log instead of cat
opensuse: tail the zypper log instead of cat

cat'ing the zypper log on fail gets to be overwhelming. The last 300
lines should be sufficient for most debugging.

Signed-off-by: Blaine Gardner <135b86f2968bdbcc730c10d8ababd343bb675986@suse.com>

JrCs/ceph-docker,ceph/ceph-docker,JrCs/ceph-docker,JrCs/ceph-docker,ceph/ceph-docker