x/ref: Flatten services/security/{discharger,role}

We're moving to a flatter package structure, so we will no longer
have services/mgmt or services/security.  This is a mechanical
change along those lines.

services/security/discharger.vdl -> services/discharger
services/security/discharger -> services/discharger/dischargerlib
services/security/role.vdl   -> services/role
services/security/roled      -> services/role/roled

Change-Id: Ia11539df7c97a01107de87ac05618b5df3295112
19 files changed