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

[myii]

• Follows on from #166
• Semi-automated using https://github.com/myii/ssf-formula/pull/33

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test(pillar): remove deprecated option and disabled method

• https://travis-ci.org/myii/openssh-formula/jobs/585340845#L1811-L1813:

/home/kitchen/__salt.tmp.9rqda9ha line 15: Deprecated option UsePrivilegeSeparation
Disabled method "keyboard-interactive" in AuthenticationMethods list "publickey,keyboard-interactive"
AuthenticationMethods cannot be satisfied by enabled authentication methods

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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:

       [SSH] connection failed, retrying in 1 seconds (#<Net::SSH::AuthenticationFailed: Authentication failed for user kitchen@localhost>)
       [SSH] connection failed, retrying in 1 seconds (#<Net::SSH::AuthenticationFailed: Authentication failed for user kitchen@localhost>)
       [SSH] connection failed, retrying in 1 seconds (#<Net::SSH::AuthenticationFailed: Authentication failed for user kitchen@localhost>)
       [SSH] connection failed, retrying in 1 seconds (#<Net::SSH::AuthenticationFailed: Authentication failed for user kitchen@localhost>)
$$$$$$ [SSH] connection failed, terminating (#<Net::SSH::AuthenticationFailed: Authentication failed for user kitchen@localhost>)
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: 1 actions failed.
>>>>>>     Failed to complete #verify action: [Transport error, can't connect to 'ssh' backend: SSH session could not be established] on default-debian-10-develop-py3

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[saltstack-formulas-travis]

:tada: This PR is included in version 0.42.1 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket:

[daks]

oh already merged, didn't had time to review it. Just a question: I thought the plan was to move from serverspec to inspec but I'm not sure this was the purpose of this PR because serverspec tests are still there.

[myii]

@daks I've left the Serverspec tests there for the time being, until the Vagrant issues are resolved. It all works fine together in the meanwhile.