test/run: Temporarily disable distribution tests

They're too slow to cope with current release cycles, and they
haven't found bugs in months, also because clang-tidy and cppcheck
would find most of them earlier.

Disable them for the moment. We should pre-install gcc and make in
non-x86 images, as those run on my test machine with qemu TCG, and
that's the real slow-down here. Then we can re-enable them.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

test/run

@@ -110,12 +110,16 @@ run() {
 	test passt_in_ns/shutdown
 	teardown passt_in_ns
 
+	# TODO: Make those faster by at least pre-installing gcc and make on
+	# non-x86 images, then re-enable.
+skip_distro() {
 	setup distro
 	test distro/debian
 	test distro/fedora
 	test distro/opensuse
 	test distro/ubuntu
 	teardown distro
+}
 
 	perf_finish
 	[ ${CI} -eq 1 ] && video_stop