WifiConfiguration: show more detail in toString()

When debugging WiFi issues, it's helpful to know whether
or not a network uses a hidden SSID. Update
WifiConfiguration.toString(), to provide this information.

BUG=26836097
TEST=capture bugreport, verify "HIDDEN: false" is present for normal net
TEST=capture bugreport, verify "HIDDEN: true" is present for hidden net

Change-Id: I1f7c587fc2eda358e0868e9a7ef0bb2058e726a8
1 file changed