Add optional auth credentials to Jolokia plugin

closes #414

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Features
 - [#412](https://github.com/influxdb/telegraf/pull/412): Additional memcached stats. Thanks @mgresser!
 - [#410](https://github.com/influxdb/telegraf/pull/410): Additional redis metrics. Thanks @vlaadbrain!
+- [#414](https://github.com/influxdb/telegraf/issues/414): Jolokia plugin auth parameters
 
 ### Bugfixes
 - [#405](https://github.com/influxdb/telegraf/issues/405): Prometheus output cardinality issue

plugins/jolokia/jolokia.go

@@ -15,6 +15,8 @@ import (
 type Server struct {
 	Name     string
 	Host     string
+	Username string
+	Password string
 	Port     string
 }
 
@@ -59,6 +61,8 @@ func (j *Jolokia) SampleConfig() string {
     name = "stable"
     host = "192.168.103.2"
     port = "8180"
+    # username = "myuser"
+    # password = "mypassword"
 
   # List of metrics collected on above servers
   # Each metric consists in a name, a jmx path and either a pass or drop slice attributes
@@ -193,10 +197,14 @@ func (j *Jolokia) Gather(acc plugins.Accumulator) error {
 			tags["host"] = server.Host
 
 			// Prepare URL
-			requestUrl, err := url.Parse("http://" + server.Host + ":" + server.Port + context + jmxPath)
+			requestUrl, err := url.Parse("http://" + server.Host + ":" +
+				server.Port + context + jmxPath)
 			if err != nil {
 				return err
 			}
+			if server.Username != "" || server.Password != "" {
+				requestUrl.User = url.UserPassword(server.Username, server.Password)
+			}
 
 			out, _ := j.getAttr(requestUrl)