(#8369) Add tests for ssh_connect
(#8369) Add tests for ssh_connect

Adding initial tests of ssh connection code.

Reviewed-by: Jeff McCune

puppetlabs/puppetlabs-cloud_provisioner,puppetlabs/puppetlabs-cloud_provisioner,amos6224/puppetlabs-cloud-provisioner,16nsk/puppetlabs-cloud_provisioner