Configurable per application default network

Extend networkAddUidRanges and networkRemoveUidRanges from
virtual-network-only to physical network. With this change, the
ConnectivityService can replace the default physical network for
specified applications without changing applications' code.

Bug: 176507580
Test: cd system/netd; atest
Test: atest HostsideVpnTests
Test: atest FrameworksNetTests
Change-Id: I556043f4401746bcf844a0c15a7d92aec12faad3