add "apt_remove" in lib/utils.sh

in order to manage DEBIAN_FRONTEND

tests/hardening/chrony_is_enabled_and_running.sh

@@ -0,0 +1,18 @@
+# shellcheck shell=bash
+# run-shellcheck
+test_audit() {
+
+    describe Ensure package is installed
+
+    # install dependencies
+    apt update
+    apt install -y chrony
+
+    # not much to test here, we are running in a container, we wont check service state
+    describe Checking blank host
+    register_test retvalshouldbe 0
+    run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
+
+    apt remove -y chrony
+
+}