Add portals field to iscsi volume source to achieve multipathing.

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

pkg/api/types.go

@@ -623,6 +623,10 @@ type ISCSIVolumeSource struct {
 	// the ReadOnly setting in VolumeMounts.
 	// +optional
 	ReadOnly bool
+	// Required: list of iSCSI target portal ips for high availability.
+	// the portal is either an IP or ip_addr:port if port is other than default (typically TCP ports 860 and 3260)
+	// +optional
+	Portals []string
 }
 
 // Represents a Fibre Channel volume.