Comment 1 for bug 1565849

this is performed by cliff, and implements the Demeraou-Levenshtein algorithm to find matches. see commit https://github.com/openstack/cliff/commit/3396764571f5e18f99a63f1f1160a0a6a1b3097a for additional details.

I suspect "role' is matching with router and volume since 3 out of 4 letters match (r, o ,e with router and o, l, e with volume) in order.

The `openstack create` case won't bring up all the `create` results since our implementation only matches the object/noun, not the verb (which is why it's brining up aggregate (r, e, t, e from create)