[VCN06] Support request background network

This will be mainly used by VCN management service which will
need to hold the networks but preserve the backgrounded-ness
of the networks.

Test: android.net.ConnectivityManagerTest#testRequestType
Test: android.net.cts.ConnectivityManagerTest#testRequestBackgroundNetwork /
      --rerun-until-failure 100
Test: ConnectivityServiceTest#testBackgroundNetworks
Test: m -j doc-comment-check-docs
Bug: 175662146

Change-Id: I463c7a3139a286e50ea71e674060975ce228caa9
4 files changed
tree: 55192dd32ba07f994feed3a20d08f05e45452cf0
  1. core/
  2. service/
  3. services/
  4. tests/
  5. OWNERS