Update logstash to 2.1.0

library/logstash

@@ -13,5 +13,9 @@
 2.0.0-1: git://github.com/docker-library/logstash@c218eb120f20b4c8f19e2afb235ff012a5173794 2.0
 2.0.0: git://github.com/docker-library/logstash@c218eb120f20b4c8f19e2afb235ff012a5173794 2.0
 2.0: git://github.com/docker-library/logstash@c218eb120f20b4c8f19e2afb235ff012a5173794 2.0
-2: git://github.com/docker-library/logstash@c218eb120f20b4c8f19e2afb235ff012a5173794 2.0
-latest: git://github.com/docker-library/logstash@c218eb120f20b4c8f19e2afb235ff012a5173794 2.0
+
+2.1.0-1: git://github.com/docker-library/logstash@a50f6cf48fe5c16ba2c628fffa03733732135e55 2.1
+2.1.0: git://github.com/docker-library/logstash@a50f6cf48fe5c16ba2c628fffa03733732135e55 2.1
+2.1: git://github.com/docker-library/logstash@a50f6cf48fe5c16ba2c628fffa03733732135e55 2.1
+2: git://github.com/docker-library/logstash@a50f6cf48fe5c16ba2c628fffa03733732135e55 2.1
+latest: git://github.com/docker-library/logstash@a50f6cf48fe5c16ba2c628fffa03733732135e55 2.1