Make the dumpsys connectivity shorter and easier to read.

- Print NetworkFactories on one line.
- Only print LegacyTypeTracker networks if they are connected,
  and record supported network types on a separate summary line.
- Print all tethering upstreams on one line.
- Summarize the state of the transition wakelock on one line.
- Don't print Inet condition reports if there are none.
  (Currently there can never be any.)

Bug: 21449922
Change-Id: Ib4b29a7fd882e6c105839a255fffecf4f346cf7e