manage tmp dir in tests

Signed-off-by: Sebastian Gumprich <[email protected]>

molecule/os_hardening/converge.yml

@@ -30,6 +30,7 @@
     os_yum_repo_file_whitelist: ['foo.repo']
     os_users_without_password_ageing: ['pw_no_ageing']
     os_netrc_enabled: false
+    os_mnt_tmp_enabled: true
     sysctl_config:
       net.ipv4.ip_forward: 0
       net.ipv6.conf.all.forwarding: 0