Add nagios parser for exec input plugin

closes #762

plugins/parsers/registry.go

@@ -8,6 +8,7 @@ import (
 	"github.com/influxdata/telegraf/plugins/parsers/graphite"
 	"github.com/influxdata/telegraf/plugins/parsers/influx"
 	"github.com/influxdata/telegraf/plugins/parsers/json"
+	"github.com/influxdata/telegraf/plugins/parsers/nagios"
 	"github.com/influxdata/telegraf/plugins/parsers/value"
 )
 
@@ -39,7 +40,7 @@ type Parser interface {
 // Config is a struct that covers the data types needed for all parser types,
 // and can be used to instantiate _any_ of the parsers.
 type Config struct {
-	// Dataformat can be one of: json, influx, graphite, value
+	// Dataformat can be one of: json, influx, graphite, value, nagios
 	DataFormat string
 
 	// Separator only applied to Graphite data.
@@ -72,6 +73,8 @@ func NewParser(config *Config) (Parser, error) {
 			config.DataType, config.DefaultTags)
 	case "influx":
 		parser, err = NewInfluxParser()
+	case "nagios":
+		parser, err = NewNagiosParser()
 	case "graphite":
 		parser, err = NewGraphiteParser(config.Separator,
 			config.Templates, config.DefaultTags)
@@ -94,6 +97,10 @@ func NewJSONParser(
 	return parser, nil
 }
 
+func NewNagiosParser() (Parser, error) {
+	return &nagios.NagiosParser{}, nil
+}
+
 func NewInfluxParser() (Parser, error) {
 	return &influx.InfluxParser{}, nil
 }