Improve dumpsys logs for NetworkProvider and NetworkOffer

It will look like below:

NetworkProviders for:
  2: WIFI_AWARE_FACTORY
  1: Ethernet

Network Offers:
  NetworkOffer [ Provider Id (1) Score(...) Caps [...] Needed by [1, 2, 3]]
  NetworkOffer [ Provider Id (2) Score(...) Caps [...] Needed by [4, 5, 6]]

Test: manual
Bug: 227408533
Change-Id: I84cb03757877d7127d39c359010c8092a8ca87d9
2 files changed