devserver.py: Create pkgroot symlink

A previous CL (crrev.com/c/2270639) removed the creation of symlink
static/pkgroot -> /build from the makefile and that cause failures in vm
tests. This CL puts back that symlink dynamically when the devserver
comes up.

BUG=chromium:1101186
TEST=./devinstall_test.py reef ~/trunk/src/build/images/reef/latest/chromiumos_test_image.bin

Change-Id: I68bc0babb668ab0589245f30a298c37e1bb1a9f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2283846
Tested-by: Amin Hassani <ahassani@chromium.org>
Auto-Submit: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Tzung-Bi Shih <tzungbi@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
1 file changed