Created AdminUsersList in the object store as a first step to implement an object store middle tier.
Some namespace fixes for unit tests.

Implemented the self registration and unregistration functions for the agent.
Improved the safeguards and imlpemented more initialize() function for different object types.

and created initial unit tests for those.

Intermediate commit: factored the base operations on ObjectOps and started to apply them to RootObject.

Implemented the new interface on the Rados backend.
Fixed several bugs.