Install irqbalance on hosts

This patch adds irqbalance to the apt package list to resolve
the issue where a deployer may not have the package installed
in their base OS deployment.

Change-Id: I2a4eb13beacef4122153c57ca51ce6aae8624a39
Closes-Bug: #1482146

rpc_deployment/roles/host_common/tasks/irqbalance.yml

@@ -13,6 +13,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Install irqbalance
+  apt:
+    pkg: irqbalance
+    state: present
+    update_cache: yes
+    cache_valid_time: 600
+  register: pkgs
+  until: pkgs|success
+
 - name: Drop irqbalance default
   template:
     src: "irqbalance"