Don't include ancient preflight binhosts for SDK

These GS buckets were all deleted and so updating the SDK breaks when
we try to pull binpkgs from them.

BUG=chromium:1015830
TEST=`cros_sdk --replace` succeeds and uses correct binpkgs

Change-Id: I3e8b365c11a1c6c2032ba58f65679d1bbd26189a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/1869404
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
(cherry picked from commit 061703d035ba390593a2f5a9ff0c7979a3282181)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/1869872
Commit-Queue: Srinivasa duvvuri <sduvvuri@google.com>
Commit-Queue: Bhogeswara Metta <bhogeswar.m@gmail.com>
Tested-by: Bhogeswara Metta <bhogeswar.m@gmail.com>
1 file changed