ci: Temporarily import kola test from jlebon's FCOS fork

That test will not make it into the fedora-coreos-config repo until the
libostree fix gets percolated down. PR is:

https://github.com/coreos/fedora-coreos-config/pull/586

But we want to make sure that the fix does work and that we don't
regress on it. So manually fetch it for now.

.cci.jenkinsfile

@@ -72,6 +72,12 @@ parallel fcos: {
         tar -C insttree -xzvf insttree.tar.gz
         rsync -rlv insttree/ /
         coreos-assembler init --force https://github.com/coreos/fedora-coreos-config
+        # XXX: We temporarily add these tests until they get merged into FCOS proper
+        (mkdir -p tests/kola/var-mount
+         cd tests/kola/var-mount
+         curl -L --remote-name-all \
+            https://raw.githubusercontent.com/jlebon/fedora-coreos-config/pr/var-mount/tests/kola/var-mount/{config.ign,test.sh}
+         chmod a+x test.sh)
         mkdir -p overrides/rootfs
         mv insttree/* overrides/rootfs/
         rmdir insttree