eCTS: Switch execution environment to chroot
eCTS: Switch execution environment to chroot

Openocd is upgraded to 0.10.0, which supports stm32l476. So, now
we can run eCTS inside chroot. This allows new developers to spend
no time on setting up software as all necessary tools (e.g. specific
version of make, openocd, lsusb, ARM toolchains) come with cros_sdk.

BUG=chromium:653949
BRANCH=none
TEST=cts/cts.py -m meta

Change-Id: Iba7ba94e95ceadcedcb53b76e47054ba1b2b47dd
Signed-off-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/542017
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec