Deprecate the recommendation request code.

All deprecated code in this CL intended to be removed before the
API freeze.

Test: adb shell am instrument -e class android.net.NetworkRecommendationProviderTest -w com.android.frameworks.coretests/android.support.test.runner.AndroidJUnitRunner

Bug: 37357264
Change-Id: Id7eade4ede0fbe0961de140fcf7109e30d6e32c2
4 files changed