Need this on Arch Linux to avoid the `kitchen verify` failure; see:

* https://gitlab.com/saltstack-formulas/infrastructure/salt-image-builder/-/commit/cb6781a2bba9

The debug output of test jobs don't show the use of TOFS as it should
and the pillar.example show that `tofs` is under `mine_functions`
instead of `openssh`.

* pillar.example: move `tofs` under `openssh`.

* test/salt/pillar/default.sls: ditoo.

* ci(kitchen): use `openssh.config` as `state_top`
* Semi-automated using https://github.com/myii/ssf-formula/pull/33
* test(pillar): remove deprecated option and disabled method
* https://travis-ci.org/myii/openssh-formula/jobs/585340845#L1811-L1813:
* test(pillar): use same SSH options as used by Travis
* Using existing options locks out after `kitchen converge` (before `verify`)
* https://travis-ci.org/myii/openssh-formula/jobs/585356835#L2957-L2965:
* test(inspec): add tests based on existing Serverspec tests
* Follows on from #166

* Close #165
* Move existing `.kitchen.yml` => `kitchen.vagrant.yml`
* Semi-automated using https://github.com/myii/ssf-formula/pull/30
* Fix errors shown below:

```bash
openssh-formula$ yamllint -s .
./pillar.example
  49:3      error    duplication of key "AllowUsers" in mapping  (key-duplicates)
  57:3      error    duplication of key "DenyUsers" in mapping  (key-duplicates)
  63:3      error    duplication of key "AllowGroups" in mapping  (key-duplicates)
  70:3      error    duplication of key "DenyGroups" in mapping  (key-duplicates)
  79:24     warning  truthy value should be one of [false, true]  (truthy)
  80:29     warning  truthy value should be one of [false, true]  (truthy)
  118:4     warning  missing starting space in comment  (comments)
  119:4     warning  missing starting space in comment  (comments)
  119:89    error    line too long (122 > 88 characters)  (line-length)
  120:4     warning  missing starting space in comment  (comments)
  120:89    error    line too long (144 > 88 characters)  (line-length)
  147:30    warning  truthy value should be one of [false, true]  (truthy)
  148:21    warning  truthy value should be one of [false, true]  (truthy)
  149:19    warning  truthy value should be one of [false, true]  (truthy)
  150:32    warning  truthy value should be one of [false, true]  (truthy)
  151:26    warning  truthy value should be one of [false, true]  (truthy)
  152:31    warning  truthy value should be one of [false, true]  (truthy)
  153:32    warning  truthy value should be one of [false, true]  (truthy)
  154:29    warning  truthy value should be one of [false, true]  (truthy)
  155:34    warning  truthy value should be one of [false, true]  (truthy)
  175:8     warning  missing starting space in comment  (comments)
  175:89    error    line too long (152 > 88 characters)  (line-length)
  176:8     warning  missing starting space in comment  (comments)
  176:89    error    line too long (126 > 88 characters)  (line-length)
  177:8     warning  missing starting space in comment  (comments)
  177:89    error    line too long (148 > 88 characters)  (line-length)
  213:18    warning  truthy value should be one of [false, true]  (truthy)
  219:18    warning  truthy value should be one of [false, true]  (truthy)
  225:18    warning  truthy value should be one of [false, true]  (truthy)
  241:22    warning  truthy value should be one of [false, true]  (truthy)
  243:22    warning  truthy value should be one of [false, true]  (truthy)
  244:20    warning  truthy value should be one of [false, true]  (truthy)
  245:21    warning  truthy value should be one of [false, true]  (truthy)
  254:24    warning  truthy value should be one of [false, true]  (truthy)
  255:22    warning  truthy value should be one of [false, true]  (truthy)
  256:23    warning  truthy value should be one of [false, true]  (truthy)
  265:22    warning  truthy value should be one of [false, true]  (truthy)
  268:21    warning  truthy value should be one of [false, true]  (truthy)
  269:20    warning  truthy value should be one of [false, true]  (truthy)
  270:21    warning  truthy value should be one of [false, true]  (truthy)
  279:26    warning  truthy value should be one of [false, true]  (truthy)
  280:24    warning  truthy value should be one of [false, true]  (truthy)
  281:25    warning  truthy value should be one of [false, true]  (truthy)
  307:16    warning  truthy value should be one of [false, true]  (truthy)
  308:6     warning  missing starting space in comment  (comments)
  314:6     warning  missing starting space in comment  (comments)
  316:24    warning  truthy value should be one of [false, true]  (truthy)
  339:89    error    line too long (546 > 88 characters)  (line-length)
  340:89    error    line too long (546 > 88 characters)  (line-length)
  341:89    error    line too long (546 > 88 characters)  (line-length)
  342:89    error    line too long (546 > 88 characters)  (line-length)
  344:4     warning  missing starting space in comment  (comments)
  345:4     warning  missing starting space in comment  (comments)
  357:19    warning  truthy value should be one of [false, true]  (truthy)

./openssh/osfamilymap.yaml
  1:1       warning  missing document start "---"  (document-start)

./openssh/osfingermap.yaml
  1:1       warning  missing document start "---"  (document-start)

./openssh/osmap.yaml
  1:1       warning  missing document start "---"  (document-start)

./openssh/defaults.yaml
  1:1       warning  missing document start "---"  (document-start)
  3:18      warning  truthy value should be one of [false, true]  (truthy)
  6:34      warning  too few spaces before comment  (comments)
  10:25     warning  truthy value should be one of [false, true]  (truthy)
  12:32     warning  too few spaces before comment  (comments)
  16:24     warning  truthy value should be one of [false, true]  (truthy)
  18:24     warning  too few spaces before comment  (comments)
  20:42     warning  too few spaces before comment  (comments)
  27:6      warning  missing starting space in comment  (comments)
```