Remove attrdict and just use existing types

In order to make it simpler (and less code) just prefer to use
object types that already exist instead of trying to make dictionaries
also behave like objects.

For those that really need this kind of functionality:

https://pypi.python.org/pypi/attrdict

Change-Id: Ib7ddfa517f0500082fafac2c3e53fd6a158a6ddf
Merge "Remove attrdict and just use existing types"