propellor 0.5.1 released with [[!toggle text="these changes"]]
[[!toggleable text="""
   * Primary DNS servers now have allow-transfer automatically populated
     with the IP addresses of secondary dns servers. So, it's important
     that all secondary DNS servers have an ipv4 (and/or ipv6) property
     configured.
   * Deal with old ssh connection caching sockets.
   * Add missing build deps and deps. Closes: #[745459](http://bugs.debian.org/745459)"""]]