Install plugins pkg before td-agent

Change-Id: Ia2082e1cf870741187e5f31ccc9a2943e4958b85
diff --git a/fluentd/map.jinja b/fluentd/map.jinja
index 5652c33..9f72567 100644
--- a/fluentd/map.jinja
+++ b/fluentd/map.jinja
@@ -2,7 +2,7 @@
   'Debian': {
     'user': 'root',
     'group': 'root',
-    'pkgs': ['td-agent', 'td-agent-additional-plugins'],
+    'pkgs': ['td-agent-additional-plugins', 'td-agent'],
     'gem_path': 'td-agent-gem',
     'service_name': 'td-agent',
     'dir': {