Fix up Newton->Ocata rabbitmq ha policy

In ocata we changed the ha policy to "ha-exactly" via the following changes:
- tht: Iace6daf27a76cb8ef1050ada0de7ff1f530916c6
- puppet-tripleo: Ib62001c03e1e08f58cf0c6e0ba07a8879a584084

We initially also took care of changing this policy (which is set in the
pacemaker resource agent) for the M/N upgrade path:
I2468a096b5d7042bc801a742a7a85fb1521c1c02

In the end we decided against changing the policy in Newton as well (it
was only for ocata) as it was too close to the release date and we took
the safer path.
This patch does two things:
1) It renames the upgrade function to "newton_ocata" since that is the
only upgrade path we need to take care of
2) It reinstates the actual upgrade function which was mistakenly
removed via an unrelated change in the ceilometer upgrade path:
If9d6987cd0a8fc5d3f9de518ba422d97d5149732

Closes-Bug: #1628998

Change-Id: I3a97505d2ae1ae27f3080ffe74c33fdabffd2420

extraconfig/tasks/major_upgrade_controller_pacemaker_1.sh

@@ -31,6 +31,6 @@ fi
 # services will be restart as there are no other constraints
 if [[ -n $(is_bootstrap_node) ]]; then
     migrate_full_to_ng_ha
-    rabbitmq_mitaka_newton_upgrade
+    rabbitmq_newton_ocata_upgrade
 fi
 

extraconfig/tasks/major_upgrade_pacemaker_migrations.sh

@@ -179,3 +179,23 @@ function disable_standalone_ceilometer_api {
         fi
     fi
 }
+
+
+# This function will make sure that the rabbitmq ha policies are converted from mitaka to newton
+# In newton we had: Attributes: set_policy="ha-all ^(?!amq\.).* {"ha-mode":"all"}"
+# In ocata we want: Attributes: set_policy="ha-all ^(?!amq\.).* {"ha-mode":"exactly","ha-params":2}"
+# The nr "2" should be CEIL(N/2) where N is the number of Controllers (i.e. rabbit instances)
+# Note that changing an attribute like this makes the rabbitmq resource restart
+function rabbitmq_newton_ocata_upgrade {
+    if pcs resource show rabbitmq-clone | grep -q -E "Attributes:.*\"ha-mode\":\"all\""; then
+        # Number of controller is obtained by counting how many hostnames we
+        # have in controller_node_names hiera key
+        nr_controllers=$(($(hiera controller_node_names | grep -o "," |wc -l) + 1))
+        nr_queues=$(($nr_controllers / 2 + ($nr_controllers % 2)))
+        if ! [ $nr_queues -gt 0 -a $nr_queues -le $nr_controllers ]; then
+            echo_error "ERROR: The nr. of HA queues during the M/N upgrade is out of range $nr_queues"
+            exit 1
+        fi
+        pcs resource update rabbitmq set_policy='ha-all ^(?!amq\\.).* {"ha-mode":"exactly","ha-params":'"$nr_queues}" --wait=600
+    fi
+}