Some of the WifiManager tests assumed that WiFi is always supported.
This is not true for all devices, for example the Android emulator, and
is not a requirement in the CDD.
BUG: 37633976
Test: Successfully ran 'run cts -m CtsNetTestCases'
Change-Id: Ia6d62e8d2b6e0b0c2ef2fafd50529e722e4419e4
(cherry picked from commit 9703adffd5e3bf85e482cdac45a1147caff4ac3d)