Update Monasca Log Persister config

* Make number of threads configurable
* Improve naming
* Update path and log options for Logstash 2.4
* Use the correct logs directory

Partially-Implements: blueprint monasca-roles
Change-Id: I09388de4d31740f2786393c957201bd037572226

ansible/roles/monasca/templates/monasca-log-persister/log-persister.conf.j2

@@ -4,7 +4,9 @@ input {
     kafka {
         zk_connect => "{{ monasca_zookeeper_servers }}"
         topic_id => "{{ monasca_transformed_logs_topic }}"
-        group_id => "transformer-logstash-consumer"
+        group_id => "log_persister"
+        consumer_id => "log_persister_{{ ansible_hostname }}"
+        consumer_threads => "{{ monasca_log_pipeline_threads }}"
     }
 }
 

ansible/roles/monasca/templates/monasca-log-persister/monasca-log-persister.json.j2

 {
-    "command": "/usr/share/logstash/bin/logstash --log-in-json --log /var/log/kolla/monasca/monasca-log-persister.log -f /etc/logstash/conf.d/log-persister.conf",
+    "command": "/opt/logstash/bin/logstash --log-in-json --log /var/log/kolla/logstash/monasca-log-persister.log -f /etc/logstash/conf.d/log-persister.conf",
     "config_files": [
         {
             "source": "{{ container_config_directory }}/log-persister.conf",
@@ -16,7 +16,7 @@
     ],
     "permissions": [
         {
-            "path": "/var/log/kolla/monasca",
+            "path": "/var/log/kolla/logstash",
             "owner": "logstash:kolla",
             "recurse": true
         }