qemu-io: correctly print non-integer values as decimals

qemu-io: correctly print non-integer values as decimals

qemu-io's cvtstr function sometimes will incorrectly omit the
decimal part of the number, and sometimes will incorrectly include
it.  This patch fixes both.  The former is more serious, and can
be seen in the patches to 027.out and 033.out.

The changes to all other files were scripted with sed, so there were
no "surprises" beyond 027.out and 033.out.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>