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

pkg/api/v1/zz_generated.conversion.go

@@ -275,6 +275,8 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 		Convert_api_PodTemplateList_To_v1_PodTemplateList,
 		Convert_v1_PodTemplateSpec_To_api_PodTemplateSpec,
 		Convert_api_PodTemplateSpec_To_v1_PodTemplateSpec,
+		Convert_v1_PortworxVolumeSource_To_api_PortworxVolumeSource,
+		Convert_api_PortworxVolumeSource_To_v1_PortworxVolumeSource,
 		Convert_v1_Preconditions_To_api_Preconditions,
 		Convert_api_Preconditions_To_v1_Preconditions,
 		Convert_v1_PreferAvoidPodsEntry_To_api_PreferAvoidPodsEntry,
@@ -2706,6 +2708,7 @@ func autoConvert_v1_PersistentVolumeSource_To_api_PersistentVolumeSource(in *Per
 	out.Quobyte = (*api.QuobyteVolumeSource)(unsafe.Pointer(in.Quobyte))
 	out.AzureDisk = (*api.AzureDiskVolumeSource)(unsafe.Pointer(in.AzureDisk))
 	out.PhotonPersistentDisk = (*api.PhotonPersistentDiskVolumeSource)(unsafe.Pointer(in.PhotonPersistentDisk))
+	out.PortworxVolume = (*api.PortworxVolumeSource)(unsafe.Pointer(in.PortworxVolume))
 	return nil
 }
 
@@ -2731,6 +2734,7 @@ func autoConvert_api_PersistentVolumeSource_To_v1_PersistentVolumeSource(in *api
 	out.VsphereVolume = (*VsphereVirtualDiskVolumeSource)(unsafe.Pointer(in.VsphereVolume))
 	out.AzureDisk = (*AzureDiskVolumeSource)(unsafe.Pointer(in.AzureDisk))
 	out.PhotonPersistentDisk = (*PhotonPersistentDiskVolumeSource)(unsafe.Pointer(in.PhotonPersistentDisk))
+	out.PortworxVolume = (*PortworxVolumeSource)(unsafe.Pointer(in.PortworxVolume))
 	return nil
 }
 
@@ -3341,6 +3345,28 @@ func autoConvert_api_PodTemplateSpec_To_v1_PodTemplateSpec(in *api.PodTemplateSp
 	return nil
 }
 
+func autoConvert_v1_PortworxVolumeSource_To_api_PortworxVolumeSource(in *PortworxVolumeSource, out *api.PortworxVolumeSource, s conversion.Scope) error {
+	out.VolumeID = in.VolumeID
+	out.FSType = in.FSType
+	out.ReadOnly = in.ReadOnly
+	return nil
+}
+
+func Convert_v1_PortworxVolumeSource_To_api_PortworxVolumeSource(in *PortworxVolumeSource, out *api.PortworxVolumeSource, s conversion.Scope) error {
+	return autoConvert_v1_PortworxVolumeSource_To_api_PortworxVolumeSource(in, out, s)
+}
+
+func autoConvert_api_PortworxVolumeSource_To_v1_PortworxVolumeSource(in *api.PortworxVolumeSource, out *PortworxVolumeSource, s conversion.Scope) error {
+	out.VolumeID = in.VolumeID
+	out.FSType = in.FSType
+	out.ReadOnly = in.ReadOnly
+	return nil
+}
+
+func Convert_api_PortworxVolumeSource_To_v1_PortworxVolumeSource(in *api.PortworxVolumeSource, out *PortworxVolumeSource, s conversion.Scope) error {
+	return autoConvert_api_PortworxVolumeSource_To_v1_PortworxVolumeSource(in, out, s)
+}
+
 func autoConvert_v1_Preconditions_To_api_Preconditions(in *Preconditions, out *api.Preconditions, s conversion.Scope) error {
 	out.UID = (*types.UID)(unsafe.Pointer(in.UID))
 	return nil
@@ -4458,6 +4484,7 @@ func autoConvert_v1_VolumeSource_To_api_VolumeSource(in *VolumeSource, out *api.
 	out.AzureDisk = (*api.AzureDiskVolumeSource)(unsafe.Pointer(in.AzureDisk))
 	out.PhotonPersistentDisk = (*api.PhotonPersistentDiskVolumeSource)(unsafe.Pointer(in.PhotonPersistentDisk))
 	out.Projected = (*api.ProjectedVolumeSource)(unsafe.Pointer(in.Projected))
+	out.PortworxVolume = (*api.PortworxVolumeSource)(unsafe.Pointer(in.PortworxVolume))
 	return nil
 }
 
@@ -4490,6 +4517,7 @@ func autoConvert_api_VolumeSource_To_v1_VolumeSource(in *api.VolumeSource, out *
 	out.AzureDisk = (*AzureDiskVolumeSource)(unsafe.Pointer(in.AzureDisk))
 	out.PhotonPersistentDisk = (*PhotonPersistentDiskVolumeSource)(unsafe.Pointer(in.PhotonPersistentDisk))
 	out.Projected = (*ProjectedVolumeSource)(unsafe.Pointer(in.Projected))
+	out.PortworxVolume = (*PortworxVolumeSource)(unsafe.Pointer(in.PortworxVolume))
 	return nil
 }