gives easy reload without restart and this way the lists may be
controlled via irc

this also stops sharing the same blacklists for phab and bugzilla so
they may be administered independently.

list changes may be done via regular rbot config commands or the
conf.yaml.

e.g
```
/msg bot config add #kde-neon to bugzilla.url_blacklist
/msg bot config add #kde-neon to phabricator.url_blacklist
/msg bot config get phabricator.url_blacklist
```