Merge tag 'android-8.1.0_r28' of https://android.googlesource.com/platform//frameworks/opt/net/ims into HEAD

Android 8.1.0 Release 28 (OPM4.171019.016.B1)
tree: 877c56b7ce6d10adb4d9b04c573a91224df3844f
  1. src/
  2. tests/
  3. Android.mk
  4. CleanSpec.mk
  5. OWNERS
  6. README.txt