* Automated using https://github.com/myii/ssf-formula/pull/223

* Automated using https://github.com/myii/ssf-formula/pull/207
* Use `bionic` for Travis (also no longer need to use `pip3`)
* Add `without-ipv6` suite, to avoid errors with `ip6tables` such as:

```
[ERROR   ] stdout: ERROR: initcaps
[Errno 2] ip6tables v1.8.4 (legacy): can't initialize ip6tables table `filter': Table does not exist (do you need to insmod?)
Perhaps ip6tables or your kernel needs to be upgraded.
```

* Automated using https://github.com/myii/ssf-formula/pull/167

* Automated using https://github.com/myii/ssf-formula/pull/124

* Automated using https://github.com/myii/ssf-formula/pull/93

* Automated using https://github.com/myii/ssf-formula/pull/86

* Automated using https://github.com/myii/ssf-formula/pull/84

* Automated using https://github.com/myii/ssf-formula/pull/53

* Automated using https://github.com/myii/ssf-formula/pull/52

* Automated using https://github.com/myii/ssf-formula/pull/41

* Automated using https://github.com/myii/ssf-formula/pull/40

* Automated using https://github.com/myii/ssf-formula/pull/22

* Automated using https://github.com/myii/ssf-formula/pull/23

* Automated using `ssf-formula` (v0.1.0-rc.1)

* Use balanced matrix based on `template-formula` guidelines
* Initial ref: https://github.com/saltstack-formulas/template-formula/issues/118

The "limit" and "deny" parameters have been added to both the services and
applications sections. Setting "limit: True" will use the "ufw limit" command
instead of "ufw allow". Likewise, setting "deny: True" will use the "ufw deny"
command.