Portworx Volume Driver in Kubernetes

- Add a new type PortworxVolumeSource
- Implement the kubernetes volume plugin for Portworx Volumes under pkg/volume/portworx
- The Portworx Volume Driver uses the libopenstorage/openstorage specifications and apis for volume operations.

Changes for k8s configuration and examples for portworx volumes.

- Add PortworxVolume hooks in kubectl, kube-controller-manager and validation.
- Add a README for PortworxVolume usage as PVs, PVCs and StorageClass.
- Add example spec files

Handle code review comments.

- Modified READMEs to incorporate to suggestions.
- Add a test for ReadWriteMany access mode.
- Use util.UnmountPath in TearDown.
- Add ReadOnly flag to PortworxVolumeSource
- Use hostname:port instead of unix sockets
- Delete the mount dir in TearDown.
- Fix link issue in persistentvolumes README
- In unit test check for mountpath after Setup is done.
- Add PVC Claim Name as a Portworx Volume Label

Generated code and documentation.
- Updated swagger spec
- Updated api-reference docs
- Updated generated code under pkg/api/v1

Godeps update for Portworx Volume Driver
- Adds github.com/libopenstorage/openstorage
- Adds go.pedge.io/pb/go/google/protobuf
- Updates Godep Licenses

docs/api-reference/batch/v1/definitions.html

@@ -1655,6 +1655,54 @@ span.icon > [class^="icon-"], span.icon > [class*=" icon-"] { cursor: default; }
 </tbody>
 </table>
 
+</div>
+<div class="sect2">
+<h3 id="_v1_portworxvolumesource">v1.PortworxVolumeSource</h3>
+<div class="paragraph">
+<p>PortworxVolumeSource represents a Portworx volume resource.</p>
+</div>
+<table class="tableblock frame-all grid-all" style="width:100%; ">
+<colgroup>
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;"> 
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Description</th>
+<th class="tableblock halign-left valign-top">Required</th>
+<th class="tableblock halign-left valign-top">Schema</th>
+<th class="tableblock halign-left valign-top">Default</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">volumeID</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">VolumeID uniquely identifies a Portworx volume</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">FSType represents the filesystem type to mount Must be a filesystem type supported by the host operating system. Ex. "ext4", "xfs". Implicitly inferred to be "ext4" if unspecified.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">readOnly</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Defaults to false (read/write). ReadOnly here will force the ReadOnly setting in VolumeMounts.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+</tr>
+</tbody>
+</table>
+
 </div>
 <div class="sect2">
 <h3 id="_v1_localobjectreference">v1.LocalObjectReference</h3>
@@ -4224,6 +4272,13 @@ Populated by the system when a graceful deletion is requested. Read-only. More i
 <td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v1_projectedvolumesource">v1.ProjectedVolumeSource</a></p></td>
 <td class="tableblock halign-left valign-top"></td>
 </tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">portworxVolume</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">PortworxVolume represents a portworx volume attached and mounted on kubelets host machine</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v1_portworxvolumesource">v1.PortworxVolumeSource</a></p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
 </tbody>
 </table>
 
@@ -5321,7 +5376,7 @@ Examples:<br>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2017-02-23 20:32:42 UTC
+Last updated 2017-02-27 07:16:35 UTC
 </div>
 </div>
 </body>