improve abstractconcretebase

improve abstractconcretebase

try to limit the attributes on the base and set up wpoly
etc so that things still work the way we want.

It seems like I've tried this in the past before so not sure
if this is actually working or if there are problems.   it needs
a little more strictness on how you set up your base since
attributes are no longer implicit.  So, it seems like perhaps
the new behavior should be on a flag or something like
"strict_attributes=True", something like that, so that nothing
breaks for existing users and we can slowly deal with the new
way being a little bit less worse than the old way.

Fixes: #8403
Change-Id: Ic9652d9a0b024d649807aaf3505e67173e7dc3b9