Add connection timeout configuration for InfluxDB.

agent.go

@@ -70,6 +70,7 @@ func (agent *Agent) Connect() error {
 		Username:  config.Username,
 		Password:  config.Password,
 		UserAgent: config.UserAgent,
+		Timeout:   config.Timeout * time.Second,
 	})
 
 	if err != nil {

config.go

@@ -34,6 +34,7 @@ type Config struct {
 	Password  string
 	Database  string
 	UserAgent string
+	Timeout   time.Duration
 	Tags      map[string]string
 
 	agent   *ast.Table
@@ -243,6 +244,10 @@ url = "http://localhost:8086" # required.
 # The target database for metrics. This database must already exist
 database = "telegraf" # required.
 
+# Timeout in seconds (for the connection with InfluxDB).
+# If not provided, will default to 0 (no timeout)
+# timeout = 5
+
 # username = "telegraf"
 # password = "metricsmetricsmetricsmetrics"