Add ansible-tower.{default,sysconfig} script

The 'ansible-tower' service script now comes with an additional file:

    /etc/{default,sysconfig}/ansible-tower

This file is used to specify the services managed by the 'ansible-tower'
service script.  The presence of this file allows admins (or the setup
playbook) to customize the services managed.  For example, when using a
remote postgres server, one would remove 'postgresql' from the list of
tower managed services.

tools/scripts/ansible-tower

@@ -18,18 +18,16 @@
 
 # Default configured services
 if [ -e /etc/debian_version ]; then
-    SERVICES="postgresql redis-server apache2 supervisor"
-    TOWER_CONFIG="/etc/default/tower"
+    TOWER_CONFIG="/etc/default/ansible-tower"
 else
-    SERVICES="postgresql redis httpd supervisord"
-    TOWER_CONFIG="/etc/sysconfig/tower"
+    TOWER_CONFIG="/etc/sysconfig/ansible-tower"
 fi
 
-# Load any configuration
+# Load default configuration
 [ -e "${TOWER_CONFIG}" ] && . "${TOWER_CONFIG}"
 
 service_action() {
-    for svc in ${SERVICES}; do
+    for svc in ${TOWER_SERVICES}; do
         service ${svc} $1
         this_return=$?
         if [ $this_return -gt $worst_return ]; then