build: remove info that image squash support is disabled
build: remove info that image squash support is disabled

We do not tell that optionX or optionY is disabled so why we have to
inform that image squash is disabled?

This is an option which has to be enabled and then informing that it is
enabled has sense.

Change-Id: I14b9b02e3cb290128d9f7673df8efe61aaa08c31

openstack/kolla,openstack/kolla,rahulunair/kolla,stackforge/kolla,rahulunair/kolla,stackforge/kolla,stackforge/kolla