fmf: Show all cockpit package versions

This will help us to investigate issues like in [1] where Testing Farm's
greedy tag repo stomps over our COPR config.

fedora-selinux/selinux-policy#1870 (comment)

test/browser/browser.sh

@@ -18,7 +18,7 @@ chmod a+w "$LOGS"
 # show some system info
 nproc
 free -h
-rpm -q cockpit-system
+rpm -qa | grep cockpit
 
 # install firefox (available everywhere in Fedora and RHEL)
 # we don't need the H.264 codec, and it is sometimes not available (rhbz#2005760)