Use timeout smaller than 10 seconds

closes #959

plugins/inputs/mongodb/mongodb.go

@@ -103,7 +103,7 @@ func (m *MongoDB) gatherServer(server *Server, acc telegraf.Accumulator) error {
 				dialAddrs[0], err.Error())
 		}
 		dialInfo.Direct = true
-		dialInfo.Timeout = time.Duration(10) * time.Second
+		dialInfo.Timeout = 5 * time.Second
 
 		if m.Ssl.Enabled {
 			tlsConfig := &tls.Config{}

plugins/inputs/mongodb/mongodb_test.go

@@ -43,7 +43,7 @@ func testSetup(m *testing.M) {
 		log.Fatalf("Unable to parse URL (%s), %s\n", dialAddrs[0], err.Error())
 	}
 	dialInfo.Direct = true
-	dialInfo.Timeout = time.Duration(10) * time.Second
+	dialInfo.Timeout = 5 * time.Second
 	sess, err := mgo.DialWithInfo(dialInfo)
 	if err != nil {
 		log.Fatalf("Unable to connect to MongoDB, %s\n", err.Error())