Add squash-all, fix squash option in build

Translate the podman build --squash command to podman build --layers=false which
has the same functionality as docker build --squash. Add a new option --squash-all
which will squash all layers into one. This will be translated to buildah bud --squash
for the buildah bud api.

Also allow only one option, squash, layers or squash--all to be used per build command.

Fixes: https://github.com/containers/buildah/issues/1234

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

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