Update keystone bind_host value to 0.0.0.0

Currently this is configured as 127.0.0.1 which disallows
Identity Service API calls from remote hosts. Updated to
0.0.0.0 so as to allow remote connections but not break
any 127.0.0.1 requests. This is actually the default value
but rather then undef the param I am just changing it.

manifests/all.pp

@@ -116,7 +116,7 @@ class openstack::all(
   # set up keystone
   class { 'keystone':
     admin_token  => $keystone_admin_token,
-    bind_host    => '127.0.0.1',
+    bind_host    => '0.0.0.0',
     log_verbose  => $verbose,
     log_debug    => $verbose,
     catalog_type => 'sql',