scsi: Allow SCSI drives to be passed for volumes

Similar to rootfs, add support for SCSI disk to be passed
for a volume mount.

Fixes #209

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

agent.go

@@ -1306,6 +1306,15 @@ func addMounts(config *configs.Config, fsmaps []hyper.Fsmap) error {
 	for _, fsmap := range fsmaps {
 
 		source := fsmap.Source
+		var err error
+
+		if fsmap.SCSIAddr != "" {
+			source, err = getSCSIDisk(fsmap.SCSIAddr)
+			if err != nil {
+				return err
+			}
+		}
+
 		if !fsmap.AbsolutePath {
 			source = filepath.Join(mountShareDirDest, fsmap.Source)
 		}

api/commands.go

@@ -110,6 +110,11 @@ type Fsmap struct {
 	AbsolutePath bool   `json:"absolutePath"`
 	ReadOnly     bool   `json:"readOnly"`
 	DockerVolume bool   `json:"dockerVolume"`
+
+	// SCSIAddr is the SCSI address in the format SCSI-id:LUN.
+	// If SCSIAddr is provided, we use that to determine the device name to be mounted
+	// ignoring the Source field that is used for as the source location for mounting otherwise.
+	SCSIAddr string `json:"scsiAddr,omitempty"`
 }
 
 // Capabilities specify the capabilities to keep when executing the process inside the container.