Add known_hosts class

The functionality for creating a known_hosts file is not currently
in puppet-zuul, and it's instead put on wrapper classes using it
like openstackci::zuul_scheduler:
http://git.openstack.org/cgit/openstack-infra/puppet-openstackci/tree/manifests/zuul_scheduler.pp

This change allows better downstream consumption of the module
by just providing it on puppet-zuul

Change-Id: I020b3379bf30861db93cc5f1b1d31a096335baba

manifests/known_hosts.pp

@@ -0,0 +1,37 @@
+# Copyright 2015 Hewlett-Packard Development Company, L.P.
+# Copyright 2015 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+# == Class: zuul::known_hosts
+#
+class zuul::known_hosts (
+  $known_hosts_content
+) {
+  file { '/home/zuul/.ssh':
+    ensure  => directory,
+    owner   => 'zuul',
+    group   => 'zuul',
+    mode    => '0700',
+    require => Class['::zuul'],
+  }
+  file { '/home/zuul/.ssh/known_hosts':
+    ensure  => present,
+    owner   => 'zuul',
+    group   => 'zuul',
+    mode    => '0600',
+    content => $known_hosts_content,
+    replace => true,
+    require => File['/home/zuul/.ssh'],
+  }
+}