VirtHCK: Change image names extensions from RAW to QCOW2
VirtHCK: Change image names extensions from RAW to QCOW2

Signed-off-by: Dmitry Fleytman <a8cf97adadec4e1b734a39bc5aea71b5741cfca1@daynix.com>

sameehj/VirtHCK,daynix/VirtHCK,igord-daynix/VirtHCK