ci(fedora): Stop installing vpnc for now

Installing /usr/bin/vpnc brings vpnc-consoleuser, which then fails to
install, see https://bugzilla.redhat.com/show_bug.cgi?id=2341517. From
what I understand this issue started when bin and sbin were unified:
https://fedoraproject.org/wiki/Changes/Unify_bin_and_sbin

Author: yedayak

test/docker/fedoradev/install-packages.sh

@@ -18,8 +18,11 @@ while read -r file; do
         /*) printf "%s\n" "$file" ;;
         *) printf "%s\n" {/usr,}/bin/"$file" ;;
     esac
-done |
+done | grep -v vpnc |
     xargs dnf -y install --skip-unavailable --skip-broken
+# /usr/bin/vpnc installs vpnc-consoleuser, which fails since bin and sbin were
+# unified. See bugzilla.redhat.com/show_bug.cgi?id=2341517
+# and https://fedoraproject.org/wiki/Changes/Unify_bin_and_sbin
 # --skip-broken: avoid failing on not found packages. Also prevents actually
 # broken packages from failing the install which is not what we want, but
 # there doesn't seem to be way to cleanly just skip the not found ones.