This adds two new shell commands to ConnectivityService that sets
a given UID to fall back to a given transport type if there is no
system default network. The syntax is:
cmd connectivity set-debug-fallback-network-for-uid <uid> <transport>
cmd connectivity clear-debug-fallback-network-for-uid <uid>
This works only on debug builds and should be used only for
manual testing.
Test: none yet
Bug: 410731080
Flag: TEST_ONLY
Change-Id: I9e0ac0713dbb95e59b22faa7cd45bdc8c1070f08
4a8e41d2ae