[NAN] Re-factor connect/config flow

Simplify flow: configure and connect in a single call.
Prevent info leak: no longer provide configuration back to caller.

Bug: 27617910
Bug: 27553226
Bug: 27579450
Change-Id: I8ed378a28a0794940583b868c8d7ac05967c77d0
12 files changed
tree: 277a9b0d1a0a738032fc2cd2043845c1335c0239
  1. service/
  2. tests/