Update to version 0.99.21
- Add babeld (Babel routing protocol daemon, RFC 6126)
- Use .tar.xz source distribution
- Drop all patches (included upstream)
- Move watchquagga to -sysvinit
(The systemd service files are now configured to automatically
restart any daemon on failure. If zebra fails, all running
daemons will be stopped; zebra will be started again; and then
the previously running daemons will be started again.)