AI 149496: Backport emulator-related donut fixes into cupcake.

AI 149496: Backport emulator-related donut fixes into cupcake.
  This includes the following fixes:
  - remove potential qemud crash at system boot
  - fix GPS fix emulation
  - fix inter-emulator networking (DNS resolution helper now behaves correctly on all IPv6-capable systems)
  - add -prop <name>=<value> option to add system properties on boot
  - allow F5 keybinding for SEARCH on keyboard-less hardware configurations
  - allow skins to provide a "search" button
  - fixed bad QADD/QSUB/QDADD/QDSUB ARM CPU instructions emulation

Automated import of CL 149496