Merge of http://go/wvgerrit/17652
This CL changes the android/build_and_run_all_unit_tests.sh script to
push exectuables to /data if it can't push to /system/bin.
The script run_all_unit_tests.sh will check if test files are in /data
and run those first, if not, it runs the files in /system/bin.
This change is needed to test unit tests on devices where /system/bin
is a read only file system, even after running "adb remount".
This CL will help verify, but will not fix
b/27678092
Change-Id: Ia0fe8c2e68722f58c2626f22113abdbdc8c5e408
a4ebdf80b5