server: implement prefix ACLs

This change implements prefix ACLs as described in the design doc.
It also removes the rpc.ServerCall argument from some functions that
don't use it at all.

Change-Id: I791d21575c6a5b5f93f9fc2d8afd63e8f4e8778d
10 files changed
tree: 26ebd2b34659ee34fe30ed77eb3230f2c2cf4373
  1. services/