Add boot test for x86 default/google_apis system image builds branch 10-18

The new branches are:
gb-emu-dev, api 10
ics-mr1-emu-dev, api 15
jb-emu-dev, api 16
jb-mr1.1-emu-dev, api 17
jb-mr2-emu-dev, api 18

This CL adds boot check for x86 images, I will submit another CL for arm images.

Change-Id: I730c942bfd9d3f9501ad7ead1d96d4ab352e444f
4 files changed
tree: c56e4acc39d33d723bee9d8078bd17c2a7af07fe
  1. build/
  2. emu_test/
  3. system_image_uitests/