Use dynamic build for Manager class

[mulkieran]

Related #1033

[mulkieran]

make_dyn_class should memo-ize the dynamically generated classes, and should take a list of keys.

[mulkieran]

The invocations of make_dyn_class are too wordy. They should be super simple, just one arg which very closely resembles the class name. make_dyn_class should then interpret that one argument.

[mulkieran]

Need to add into a test that invokes CreatePool.

[mulkieran]

This is not the correct way to do this. It should really be possible to make dynamic self-generating classes, and that would require working with dbus-python-client-gen.