Reduce yum timeout inside containers

Changed yum configuration inside Docker containers:
* Reduced retries to 5 (was 10)
* Reduced timeout to 5 (was 30)

This enables containers to fail connections to external
repositories if network connectivity is not working in
uncommon situations where DNS works, but HTTP connections
fail.

Change-Id: I06e5514157ed7bf143ac3738fd7af23ba383fdaa
Closes-Bug: #1494640

deployment/puppet/docker/manifests/container.pp

@@ -1,5 +1,7 @@
 class docker::container (
 $tz           = 'UTC',
+$yum_retries  = '5',
+$yum_timeout  = '5',
 $zoneinfo_dir = '/usr/share/zoneinfo',
 ) {
 
@@ -9,5 +11,16 @@ $zoneinfo_dir = '/usr/share/zoneinfo',
       target => "${zoneinfo_dir}/${tz}"
     }
   }
+  file_line {'yum retries':
+    path  => '/etc/yum.conf',
+    line  => "retries=${yum_retries}",
+    after => '\[main\]',
+  }
+
+  file_line {'yum timeout':
+    path  => '/etc/yum.conf',
+    line  => "timeout=${yum_timeout}",
+    after => '\[main\]',
+  }
 
 }