avoid potential regression

https://github.com/influxdata/telegraf/tree/master/plugins/inputs/http_listener_v2

http_listener has been deprecated

Signed-off-by: Cees-Jan Kiewiet <ceesjank@gmail.com>

Signed-off-by: Austin Hartzheim <austin.hartzheim@target.com>

* Add prometheus client to telegraf service
Signed-off-by: Marc Cirauqui <mcirauqui@gmail.com>

* Prometheus is an output plugin
Signed-off-by: Marc Cirauqui <mcirauqui@gmail.com>

* Check for service.enabled
Signed-off-by: Raphael Couto <raphael.couto@gmail.com>

* Removing dup lines
Signed-off-by: Raphael Couto <raphael.couto@gmail.com>

* Bump version
Signed-off-by: Raphael Couto <raphael.couto@gmail.com>

Signed-off-by: Naseem Ullah <naseemkullah@gmail.com>