Remove stressapptest.

Bug: 15193147
Add toybox to the default manifest.
Add platform/prebuilts/clang/linux-x86/host/3.6
Add platform/prebuilts/clang/darwin-x86/host/3.6
The return of external/vogar

Change-Id: I167f05bc215490a42841f325b0669b2980bf9b7c
Remove platform/packages/apps/OMA-DM - DO NOT MERGE