Don't depend on existing file perm for qemu hook
Don't depend on existing file perm for qemu hook

For defensive purposes, lets make sure the hooks/qemu file is set to be
executable. Rather than relying on the source file permissions.

Change-Id: I2130adea4855f6e989dd8fb995cb830db76ba2a1

devananda/ironic,openstack/ironic,NaohiroTamura/ironic,bacaldwell/ironic,SauloAislan/ironic,pshchelo/ironic,bacaldwell/ironic,openstack/ironic,pshchelo/ironic,NaohiroTamura/ironic,SauloAislan/ironic