Add host and port config options

[alexpop]

When using kitchen vagrant, inspec is targeting 127.0.0.1 with the forwarded port provided by kitchen:

$ kitchen verify
-----> Starting Kitchen (v1.13.2)
-----> Verifying <mysuite-centos6>...
       Use `/Users/apop/git/myapache-cookbook/test/integration/mysuite` for testing

Target:  ssh://root@127.0.0.1:2222

This prevents resources like ssl from getting a real host they can connect to. This PR adds two config options to be able to specify the host and port to be used by inspec instead on relying on the kitchen ones. Output:

$ be kitchen verify
-----> Starting Kitchen (v1.6.0)
-----> Verifying <mysuite-centos6>...
       Use `/Users/apop/git/myapache-cookbook/test/integration/mysuite` for testing

Target:  ssh://root@192.168.33.40:22

  SSL/TLS on
     ✔  192.168.33.40:443 with protocol == "tls1.2" should be enabled

[chris-rock]

Awesome work @alexpop

[chris-rock]

Nice @alexpop works like a charm