test(inspec): add tests based on existing Serverspec tests (#168)

* 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

pillar.example

@@ -14,7 +14,6 @@ sshd_config:
     - /etc/ssh/ssh_host_dsa_key
     - /etc/ssh/ssh_host_ecdsa_key
     - /etc/ssh/ssh_host_ed25519_key
-  UsePrivilegeSeparation: 'sandbox'
   SyslogFacility: AUTH
   LogLevel: INFO
   ClientAliveInterval: 0
@@ -32,7 +31,7 @@ sshd_config:
   HostbasedAuthentication: 'no'
   PermitEmptyPasswords: 'no'
   ChallengeResponseAuthentication: 'no'
-  AuthenticationMethods: 'publickey,keyboard-interactive'
+  AuthenticationMethods: 'publickey'
   AuthorizedKeysFile: '%h/.ssh/authorized_keys'
   X11Forwarding: 'no'
   X11DisplayOffset: 10