qemu-img: set encrypted disk image password (Laurent Vivier)

This patch modify qemu-img to ask and set a password when an encrypted
disk image is created.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4977 c046a42c-6fe2-441c-8c8c-71466251a162
