Add support for custom Loggly tags

[ZachEddy]

Custom Loggly Tags

This pull request allows Loggly users to customize how their logs are tagged. Inside issue #57, I describe why this functionality might be useful:

I'd like to add multiple tags to logs that are sent from Fluentd to Loggly. With the current Fluentd configuration, Loggly logs are only tagged as fleuntd and I don't have the option to add my own tags.

The proposed change enables someone to provide Fluentd with a list of custom tags. Fluentd will tag all Loggly logs according to the list of given tags. Alternatively, if no custom tags are provided, all logs are tagged as fluentd by default (to reflect the current behavior).

[pirankashani]

Hello,
I would like to customize my log with more tags. for instance if a log look likes as following:

{"log":"I1125 11:33:18.947057 1 trace.go:76] Trace[1459855838]: "Get /api/v1/namespaces/kube-system/endpoints/kube-scheduler" (started: 2017-11-25 11:33:18.315642294 +0000 UTC) (total time: 631.38115ms):\n","stream":"stderr","time":"2017-11-25T11:33:18.952213987Z"}

I need to arrange it in this way:
I = Info
1125= 25-Dec
and other items so on.

Is it possible to edit this project anyhow or I should create a Fork request? What is your idea?