Remove unneeded `meta` attribute on the model classes.
Remove unneeded `meta` attribute on the model classes.

As per the comment which was removed, these don't make sense when the
cli isn't touching the model module; We still need them on master for
now, but we can get rid of them here.

henn/haas,SahilTikale/haas,lokI8/haas,SahilTikale/switchHaaS,apoorvemohan/haas,CCI-MOC/haas,henn/hil,henn/hil_sahil,kylehogan/hil,meng-sun/hil,kylehogan/hil,meng-sun/hil,apoorvemohan/haas,henn/hil,henn/hil_sahil,kylehogan/haas