config: Query all Red Hat's non-closed bug statuses

* conf/conf.d/redhat.conf: SSIA.
Move config/option handling from PrettyBugz to main()

* bin/bugz: Move here.
* bugz/cli.py: Move from here (left only cookie handling).
* bugz/configfile.py: s/password_cmd/passwordcmd/, s/query_statuses/status/,
  remove garbage