Force-reconnect wifi (and cell) after disabling airplane mode

Wifi is not guaranteed to connect by just disabling airplane mode
or turning on wifi. Use ensureWifiConnected in the test to force
the test to reconnect to its access point.

Bug: 194413134
Change-Id: I82540a3c6fa1d50ffa39e925bdb3d214876e2083
Test: atest ConnectivityManagerTest
1 file changed