try retrying once the bzr pull operation if it fails

Signed-off-by: Mattia Rizzolo <mapreri@ubuntu.com>

utils/bzr.sh

@@ -13,7 +13,10 @@ bzr_clone_repo() {
     if [[ ! -d "${dest}" ]]; then
         bzr branch "${url}" "${dest}" -q
     else
-        (cd "${dest}" && timeout -k 11m 10m bzr pull -q)
+        # launchpad's bzr server can be way too flicky... so just retry once
+        if ! (cd "${dest}" && timeout -k 6m 5m bzr pull -q); then
+            (cd "${dest}" && timeout -k 6m 5m bzr pull -q)
+        fi
     fi
 }