Wifi test update.

Add sl4a support for testing WifiManager.buildWifiConfig
Add invalid rtt param test.
Modify the enterprise wifi connect method in sl4a to support passpoint.

Cherry-pick of https://partner-android-review.googlesource.com/#/c/215523/
Change-Id: I0fe276e0b954f3af5551196fb7f214dedfdd6d72
2 files changed