tree a750773da209dc6239057433d4b0be41d5a681e9
parent 0c8d897d303cf8ac141d5e45409e1467962cd8dc
author Steve Muckle <smuckle@google.com> 1578709708 -0800
committer Steve Muckle <smuckle@google.com> 1578953773 -0800

do not read /proc/sys/vm/drop_caches

/proc/sys/vm/drop_caches has recently been made write-only. Update the
expected permissions and do not attempt to read the file as part of the
test.

Older platforms will continue to have the previous behavior so do not
enforce there.

Bug: 147362634
Test: run vts test on cuttlefish
Change-Id: Ia4c8207e2cec8bd0c556456d60d99c3afcd94dc4