Fix usage of "|" for tests

With the more recent versions of ansible, we should now use
"is" instead of the "|" sign for the tests.

This should fix it.

Change-Id: I121deed7c095899a07ab030b77ccd7ecc55c0b18

tasks/main.yml

@@ -35,7 +35,7 @@
   when:
     - systemd_networkd_distro_packages | length > 0
   register: install_packages
-  until: install_packages|success
+  until: install_packages is success
   retries: 3
   delay: 2