Add fluend chart

This chart provides basic configuration to work with IT Monitoring Infrastructure - related issue [OS-10256] - in IT-DB we require to provide custom config for parsing, and it is easier to manage with helm all dependencies. Thus this contribution

This includes:

• magnum templates as a base
• ideas for configmaps and parsers from https://github.com/helm/charts/tree/master/stable/fluentd/templates
• docker image from https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/fluentd-elasticsearch/fluentd-es-image, the same as in the chart
• allows to customise parsers on demand

Test

helm upgrade --install --namespace kube-system --set producer="swan" --set endpoint="http://monit-logs.cern.ch:10012/"  fluentd ./fluentd

@pkothuri @strigazi