Make it possible to override chrony bindaddress

We still default to kolla_internal_vip_address. However, in some cases
this won't work, such as when kolla_internal_vip_address is a hostname,
not an IP. This way users can override it in globals.

Change-Id: I393a2a41ed3bf91f325042cca2310175927bdb40

ansible/roles/chrony/defaults/main.yml

@@ -13,6 +13,7 @@ chrony_services:
       - "/etc/localtime:/etc/localtime:ro"
       - "kolla_logs:/var/log/kolla"
 
+chrony_bindaddress: "{{ kolla_internal_vip_address }}"
 
 ####################
 # Docker

ansible/roles/chrony/templates/chrony.conf.j2

@@ -38,7 +38,7 @@ port 0
 deny all
 {% endif %}
 
-bindaddress {{ kolla_internal_vip_address }}
+bindaddress {{ chrony_bindaddress }}
 
 logchange 0.5