(#10871) Allow alternate fog credentials
(#10871) Allow alternate fog credentials

Adds the --credentials argument to pull other credentials from the
~/.fog file rather than only allowing `default` to be used.

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