Install chrony when enabled in RHEL7 STIG

Chrony was not being installed by the RHEL7 STIG package list when
enabled, causing a failure when the service configuration was
attempted.

This fixes the following failure:
http://cdn.pasteraw.com/7vo74lbz1jyf9qm5010mfqa169a8zpf

Change-Id: I6accac5504abe6fb1f2d0d0db5baa9b5a42a5c70

vars/redhat.yml

@@ -116,6 +116,10 @@ stig_packages_rhel7:
       - selinux-policy-targeted
     state: "{{ security_package_state }}"
     enabled: "{{ security_rhel7_enable_linux_security_module }}"
+  - packages:
+      - chrony
+    state: "{{ security_package_state }}"
+    enabled: "{{ security_rhel7_enable_chrony }}"
   - packages:
       - clamav
       - clamav-data

vars/ubuntu.yml

@@ -119,6 +119,10 @@ stig_packages_rhel7:
       - apparmor-utils
     state: "{{ security_package_state }}"
     enabled: "{{ security_rhel7_enable_linux_security_module }}"
+  - packages:
+      - chrony
+    state: "{{ security_package_state }}"
+    enabled: "{{ security_rhel7_enable_chrony }}"
   - packages:
       - clamav
       - clamav-daemon