title: Error: Invalid parameter boot_disk_type puppet
body: <p>I am automating the disks in google cloud platform and using puppet for that. 
  But the older parameters of adding disk on instances are not working. Do you have any idea as I am pasting an error message : </p>
  
  <pre><code>Error: Invalid parameter boot_disk_type on Gce_instance[new-instance] at /etc/puppet/manifests/gce.pp:9 on node automation
  </code></pre>
  
  <p>Here's the output of my manifest:</p>
  
  <pre><code>gce_instance { 'new-instance':
  ensure                =&gt; present,
  machine_type          =&gt; 'g1-small',
  zone                  =&gt; 'us-central1-a',
  network               =&gt; 'default',
  tags                  =&gt; ['apache', 'web'],
  image                 =&gt; 'https://www.googleapis.com/compute/v1/projects/centos-cloud/global/images/centos-6-v20150710',
  modules      =&gt; ['puppetlabs-apache', 'puppetlabs-stdlib',]
  boot_disk_type   =&gt; 'pd-ssd',
  size_gb          =&gt; '50',
  }
  </code></pre>