Fix ansible-hardening references in tox/playbook

This patch fixes the role name for ansible-hardening in tox.ini as
well as the test playbook.

Change-Id: Id26a17c484da51b67f2aa7921bb92d752d67a024
(cherry picked from commit 68ecd213b8)

tests/test.yml

@@ -75,7 +75,7 @@
         - stig_version == 'rhel6'
         - ansible_pkg_mgr == 'apt'
   roles:
-    - role: "openstack-ansible-security"
+    - role: "ansible-hardening"
   vars:
     security_pwquality_apply_rules: yes
     security_package_clean_on_remove: yes

tox.ini

@@ -24,7 +24,7 @@ whitelist_externals =
     bash
 setenv =
     PYTHONUNBUFFERED=1
-    ROLE_NAME=openstack-ansible-security
+    ROLE_NAME=ansible-hardening
     TEST_CHECK_MODE=true
     TEST_IDEMPOTENCE=true
     VIRTUAL_ENV={envdir}