Bird is now installed from wheezy-backports when on wheezy, so we get a more recent version

roles/bird/tasks/debian.yml

@@ -1,2 +1,2 @@
 - name: Install bird routing daemon
-  apt: name=bird state=present
+  apt: name=bird state=present default_release={{bird_default_release}}

roles/bird/vars/Debian-jessie.yml

@@ -1 +1,2 @@
-bird_config_dir: /etc/bird
+bird_config_dir: /etc/bird
+bird_default_release: ""

roles/bird/vars/Debian-wheezy.yml

@@ -1 +1,2 @@
-bird_config_dir: /etc
+bird_config_dir: /etc/bird
+bird_default_release: wheezy-backports

roles/bird/vars/Ubuntu-trusty.yml

@@ -1 +1,2 @@
-bird_config_dir: /etc/bird
+bird_config_dir: /etc/bird
+bird_default_release: ""