Add haveged to jenkins slaves.

We're running headless servers - exactly the situation haveged is
designed for.

Change-Id: I5616f5926aea9a573d1bf1d617f1b5b8df672917

manifests/params.pp

@@ -10,6 +10,7 @@ class jenkins::params {
       $jdk_package = 'java-1.7.0-openjdk-devel'
       $ccache_package = 'ccache'
       $python_netaddr_package = 'python-netaddr'
+      $haveged_package = 'haveged'
       # packages needed by slaves
       $ant_package = 'ant'
       $awk_package = 'gawk'
@@ -94,6 +95,7 @@ class jenkins::params {
       $jdk_package = 'openjdk-7-jdk'
       $ccache_package = 'ccache'
       $python_netaddr_package = 'python-netaddr'
+      $haveged_package = 'haveged'
       # packages needed by slaves
       $ant_package = 'ant'
       $awk_package = 'gawk'

manifests/slave.pp

@@ -27,6 +27,7 @@ class jenkins::slave(
     $::jenkins::params::jdk_package, # jdk for building java jobs
     $::jenkins::params::ccache_package,
     $::jenkins::params::python_netaddr_package, # Needed for devstack address_in_net()
+    $::jenkins::params::haveged_package, # entropy is useful to have
   ]
 
   # Packages that most jenkins slaves (eg, unit test runners) need