Initial support for dogstatsd events sent to statsd

[schahal]

Related to influxdata#5224 - Add support for dogstatsd events

[arnoldyahad]

Hey!
Thanks for making this fork, i want to use it but im having trouble trying to "make" from your fork:

go build -ldflags " -X main.commit=ccfd9ca -X main.branch=master" ./cmd/telegraf
cmd/telegraf/telegraf.go:18:2: use of internal package not allowed
cmd/telegraf/telegraf.go:19:2: use of internal package not allowed
make[1]: *** [telegraf] Error 1
make: *** [all] Error 2

[schahal]

@arnoldyahad make sure to try to clone this repo inside $GOPATH/src/github.com/influxdata... so:

$ cd $GOPATH/src/github.com/influxdata
$ git clone https://github.com/schahal/telegraf.git
...
$ git checkout feature/dogstatsd-events
...
$ make
dep ensure -vendor-only
go build -ldflags " -X main.commit=2d642c8c -X main.branch=feature/dogstatsd-events" ./cmd/telegraf
$ ls -l telegraf
-rwxr-xr-x  <redacted>  102212488 Feb 22 11:17 telegraf

As long as this fork is cloned in that path it should work (the packages in the code wont match the github URL of this fork)

Please note: you may have to install some packages manually first using go get (if it's not already done), not via dep. We have an open discussion (influxdata#5224) where in the datadog package (heavy!) creates conflicts with telegraf module dependencies, and the final version of this PR will remove that :)