util: move read_password method out of qemu-img into osdep/oslib
The qemu-img.c file has a read_password() method impl that is used to prompt for passwords on the console, with impls for POSIX and Windows. This will be needed by qemu-io.c too, so move it into the QEMU osdep/oslib files where it can be shared without code duplication Signed-off-by: NDaniel P. Berrange <berrange@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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