Fix packaging test when checking for cgroups v2

This commit fixes the packaging tests that check for whether or not
cgroups v2 are enabled. The problem was that if cgroups v2 were not
enabled the mount | grep command would fail with non-zero exit status
killing the test. This commit fixes the issue by avoiding that command
failing if cgroups v2 are not enabled.

Author: jasontedor

qa/vagrant/src/test/resources/packaging/tests/80_upgrade.bats

@@ -42,8 +42,8 @@ load $BATS_UTILS/packages.bash
 # Cleans everything for the 1st execution
 setup() {
     skip_not_dpkg_or_rpm
-    mount | grep "type cgroup2"
-    if [[ "$?" == 0 && "$(cat upgrade_from_version)" =~ 5\.1\.[12]|5\.2\.[012]|5\.3\.0 ]]; then
+    count=$(mount | grep -c "type cgroup2" || true)
+    if [[ "$count" == "1" && "$(cat upgrade_from_version)" =~ 5\.1\.[12]|5\.2\.[012]|5\.3\.0 ]]; then
       skip "version $(cat upgrade_from_version) is broken when cgroups v2 are enabled"
     fi