change to ray version 1.5.0

Rerun due to py36 wheel build failure

fix serve start namespace issue and add test (ray-project#16291)

Move scalability envelope back down to 250 nodes (ray-project#15381)

* .

* done?

* .

Co-authored-by: Alex Wu <alex@anyscale.com>

lint/docs

Remove suppress output to see why wheel is not building

Set version to 1.0.1.post1

[Test] Ignore setproctitle for local mode (ray-project#11819)

[Placement group] Refine doc (ray-project#10922)

[BRING BACK TO MASTER] Update result and fix sanity check bugs.