Identity: set the proper admin_bind_host

Following this commit[1], bind_host has been moved to public_bind_host
letting admin_bind_host undefined, hence trying to bind to 0.0.0.0.
Since HAProxy already listens on an IP address it prevents the keystone
service from starting.

[1] 9bf5e54f5c

Change-Id: I942c473e9c0ad7dcd61f10339cadddcda01e7c7b

manifests/identity.pp

@@ -543,6 +543,7 @@ class cloud::identity (
     use_syslog            => $use_syslog,
     verbose               => $verbose,
     public_bind_host      => $api_eth,
+    admin_bind_host       => $api_eth,
     log_dir               => $log_dir,
     log_file              => $log_file,
     public_port           => $ks_keystone_public_port,

spec/classes/cloud_identity_spec.rb

@@ -131,6 +131,7 @@ describe 'cloud::identity' do
         :token_provider        => 'keystone.token.providers.uuid.Provider',
         :use_syslog            => true,
         :public_bind_host      => '10.0.0.1',
+        :admin_bind_host       => '10.0.0.1',
         :public_port           => '5000',
         :admin_port            => '35357',
         :token_expiration      => '3600',