Use DEB pkgs for Fluentd plugins

On mirror.fuel-infra.org there is a package
td-agent-additional-plugins which ships all the additional
fluentd gems (plugins and its deps).

Change-Id: I055606afc873121aab4acfdb07c8fe8fe45d1bc7
Closes-Bug: PROD-17532
diff --git a/fluentd/map.jinja b/fluentd/map.jinja
index f9cc8d1..5652c33 100644
--- a/fluentd/map.jinja
+++ b/fluentd/map.jinja
@@ -2,12 +2,7 @@
   'Debian': {
     'user': 'root',
     'group': 'root',
-    'pkgs': ['td-agent', 'build-essential', 'ruby-dev'],
-    'plugin': {
-      'fluent-plugin-elasticsearch': {
-        'gem': ['fluent-plugin-elasticsearch']
-      },
-    },
+    'pkgs': ['td-agent', 'td-agent-additional-plugins'],
     'gem_path': 'td-agent-gem',
     'service_name': 'td-agent',
     'dir': {