Install nova-network package if OS is Debian-based

This patch adds a new puppet manifest and a new task to be executed in
the compute role, which will install nova-rootwrap network filters in
case the OS is Debian-based.

http://docs.midonet.org/docs/latest/quick-start-guide/ubuntu-1404_juno
/content/nova_compute_node.html

Change-Id: I6e9ca5ad5b637306cea86a13ebb0558309d4363b

deployment_scripts/puppet/manifests/midonet-install-nova-network.pp

@@ -0,0 +1,8 @@
+if $::osfamily == 'Debian' {
+
+  package { 'nova-network':
+    ensure => installed
+  }
+
+}
+

tasks.yaml

@@ -111,6 +111,16 @@
     puppet_modules: puppet/modules:/etc/puppet/modules
     timeout: 720
 
+# Install nova-rootwrap network filters
+- id: midonet_nova_network
+  role: [compute]
+  stage: post_deployment/6421
+  type: puppet
+  parameters:
+    puppet_manifest: puppet/manifests/midonet-install-nova-network.pp
+    puppet_modules: puppet/modules:/etc/puppet/modules
+    timeout: 720
+
 # Register any host that runs MidoNet agent to the default tunnelzone
 - id: midonet_host_registry
   role: [primary-controller, controller, compute, midonet-gw]