Resource managers dont't overload type

The _clusto_driver attribute is already unique per driver, while
_clusto_type should be more generic. In this case all resource managers
share the same _clusto_type except for the IP Manager, but I think that
shouldn't be the case.
Prune children searches
Merge pull request #48 from sloppyfocus/prune_search_children

Prune children searches
Merge pull request #39 from thekad/base_types

Resource managers dont't overload type