disk: Pass the --share-rw option for hotplugging disks

With qemu 2.10, a write lock was added for qcow images that
prevents the same image to be passed more than once.
This can be over-ridden using the --share-rw option which is
desired for raw images.

This solves an issue with running Kata with devicemapper
using the privileged mode as in this case all devices on the host
are passed to the container including the block device associated
with the rootfs, causing it to be passed twice to qemu.

Fixes #606

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

virtcontainers/qemu.go

@@ -689,7 +689,7 @@ func (q *qemu) hotplugBlockDevice(drive *config.BlockDrive, op operation) error
 			// PCI address is in the format bridge-addr/device-addr eg. "03/02"
 			drive.PCIAddr = fmt.Sprintf("%02x", bridge.Addr) + "/" + addr
 
-			if err = q.qmpMonitorCh.qmp.ExecutePCIDeviceAdd(q.qmpMonitorCh.ctx, drive.ID, devID, driver, addr, bridge.ID); err != nil {
+			if err = q.qmpMonitorCh.qmp.ExecutePCIDeviceAdd(q.qmpMonitorCh.ctx, drive.ID, devID, driver, addr, bridge.ID, true); err != nil {
 				return err
 			}
 		} else {
@@ -704,7 +704,7 @@ func (q *qemu) hotplugBlockDevice(drive *config.BlockDrive, op operation) error
 				return err
 			}
 
-			if err = q.qmpMonitorCh.qmp.ExecuteSCSIDeviceAdd(q.qmpMonitorCh.ctx, drive.ID, devID, driver, bus, scsiID, lun); err != nil {
+			if err = q.qmpMonitorCh.qmp.ExecuteSCSIDeviceAdd(q.qmpMonitorCh.ctx, drive.ID, devID, driver, bus, scsiID, lun, true); err != nil {
 				return err
 			}
 		}