Update wifi test to permit VirtWifi SSID

If we import newer common kernels into cuttlefish-4.4 (where we get the
stable cuttlefish kernel from) the e2e test can fail because it
*requires* the SSID to be "AndroidWifi", but the wifi driver we
upstreamed uses "VirtWifi" instead, to be less Android-y.

Update the e2e test to search for either network and succeed if
connection to either occurs.

Bug: 120682817
Bug: 122616497
Change-Id: I8823daa9b11f7635961864b1280234ed1df452a9
Signed-off-by: Alistair Strachan <astrachan@google.com>
(cherry picked from commit 56210a42)