beakerlibtests: add new test

Add slowdown for centos stream -
systemd failure:
Active: failed (Result: start-limit-hit)

tests/beakerlib/variables-support-in-profiles/main.fmf

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+summary: variables support in profiles
+description: ''
+contact: rhack@redhat.com
+component:
+  - tuned
+test: ./runtest.sh
+framework: beakerlib
+require:
+  - library(tuned/basic)
+recommend:
+  - tuned
+duration: 5m
+enabled: true
+tag:
+  - FedoraReady
+  - NoRHEL4
+  - NoRHEL5
+  - TIPfail_infra
+  - TIPpass
+  - Tier1
+tier: '1'
+link:
+  - relates: https://bugzilla.redhat.com/show_bug.cgi?id=1225124
+adjust:
+  - enabled: false
+    when: distro < rhel-7
+    continue: false
+extra-nitrate: TC#0496575
+extra-summary: /CoreOS/tuned/Sanity/variables-support-in-profiles
+extra-task: /CoreOS/tuned/Sanity/variables-support-in-profiles

tests/beakerlib/variables-support-in-profiles/runtest.sh

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+#!/bin/bash
+# vim: dict+=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   runtest.sh of /CoreOS/tuned/Sanity/variables-support-in-profiles
+#   Description: variables support in profiles
+#   Author: Branislav Blaskovic <bblaskov@redhat.com>
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Copyright Red Hat
+#
+#   SPDX-License-Identifier: GPL-2.0-or-later WITH GPL-CC-1.0
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+# Include Beaker environment
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+PACKAGE="tuned"
+
+rlJournalStart
+    rlPhaseStartSetup
+        rlAssertRpm $PACKAGE
+        rlImport "tuned/basic"
+        rlRun "TmpDir=\$(mktemp -d)" 0 "Creating tmp directory"
+        rlRun "pushd $TmpDir"
+	sleep 2
+        rlServiceStart "tuned"
+	sleep 2
+        tunedProfileBackup
+        rlFileBackup "/usr/lib/tuned/balanced/tuned.conf"
+
+        echo "
+[variables]
+SWAPPINESS1 = 70
+SWAPPINESS2 = \${SWAPPINESS1}
+
+[sysctl]
+vm.swappiness = \${SWAPPINESS2}
+" >> /usr/lib/tuned/balanced/tuned.conf
+
+        rlRun "cat /usr/lib/tuned/balanced/tuned.conf"
+
+        OLD_SWAPPINESS=$(sysctl -n vm.swappiness)
+
+    rlPhaseEnd
+
+    rlPhaseStartTest
+        rlRun "tuned-adm profile balanced"
+        rlRun -s "sysctl -n vm.swappiness"
+        rlAssertGrep "70" "$rlRun_LOG"
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+        rlRun "sysctl vm.swappiness=$OLD_SWAPPINESS"
+        rlFileRestore
+        tunedProfileRestore
+	sleep 2
+        rlServiceRestore "tuned"
+        rlRun "popd"
+        rlRun "rm -r $TmpDir" 0 "Removing tmp directory"
+    rlPhaseEnd
+rlJournalPrintText
+rlJournalEnd