tests/int/cgroups: don't check for hugetlb

Systemd is not able to delegate hugetlb controller, and it is needed for
cgroup v2 + systemd + rootless case (which is currently skipped because
of "requires rootless_cgroup", but will be enabled by a later commit).

The failure being fixed looks like this:

> not ok 4 runc create (limits + cgrouppath + permission on the cgroup dir) succeeds
> # (from function `check_cgroup_value' in file /vagrant/tests/integration/helpers.bash, line 188,
> #  in test file /vagrant/tests/integration/cgroups.bats, line 53)
> #   `check_cgroup_value "cgroup.controllers" "$(cat /sys/fs/cgroup/user.slice/user-$(id -u).slice/cgroup.controllers)"' failed
> # <....>
> # /sys/fs/cgroup/user.slice/user-2000.slice/user@2000.service/machine.slice/runc-cgroups-integration-test-20341.scope/cgroup.controllers
> # current cpuset cpu io memory pids !? cpuset cpu io memory hugetlb pids

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

tests/integration/cgroups.bats

@@ -55,8 +55,8 @@ function setup() {
 			if [ "$(id -u)" = "0" ]; then
 				check_cgroup_value "cgroup.controllers" "$(cat /sys/fs/cgroup/machine.slice/cgroup.controllers)"
 			else
-				# shellcheck disable=SC2046
-				check_cgroup_value "cgroup.controllers" "$(cat /sys/fs/cgroup/user.slice/user-$(id -u).slice/cgroup.controllers)"
+				# Filter out hugetlb as systemd is unable to delegate it.
+				check_cgroup_value "cgroup.controllers" "$(sed 's/ hugetlb//' </sys/fs/cgroup/user.slice/user-"$(id -u)".slice/cgroup.controllers)"
 			fi
 		else
 			check_cgroup_value "cgroup.controllers" "$(cat /sys/fs/cgroup/cgroup.controllers)"