Prevent Graphite reporter from modifying user tags

[fitzoh]

Context

As noted in #2069, the recently added Graphite tag support doesn't work for most metric types due to the way that the Dropwizard reporter appends metric attributes (min, max, p95, etc).

A metric that is reported this way using the traditional format:
my.timer.host.foo.max
Is currently reported like this using the tag format:
my.timer;host=foo.max

dropwizard/metrics#1576 was recently merged on the reporter side, adding a new flag to the reporter which would cause it to report the example used above as my.timer;host=foo;metricattribute=max.

What this PR does now

This PR adds a failing test to the end to end GraphiteMeterRegistryTest showing what the modified graphite output will eventually be.

It may also serve as a discussion starter around if the upstream changes to the Dropwizard metrics library are appropriate, or if more changes are required/desirable (is a metricattribute tag? Does it need to be more configurable?).

What this PR should do before merging

Pull in a Dropwizard metrics release containing dropwizard/metrics#1576 and ensure that the Graphite reporter is configured to use the tag format when appropriate.

[fitzoh]

Force pushed a minor modification to the test and updated the production code to work with io.dropwizard.metrics:metrics-graphite:4.1.8-SNAPSHOT (built locally, it doesn't appear that SNAPSHOTS are being published).

[fitzoh]

Dropwizard Metrics release is out and the build is green after forcing a rebuild.

[shakuzen]

Thanks for the change in dropwizard and corresponding fix here. We'll want to get this in the 1.5.x line also since Graphite tags support is broken there currently. I can handle this on merge.

[shakuzen]

On further consideration, due to the hard requirement on a recent patch version, it would likely cause more support issues to merge this into 1.5.x. I will make a release note that lets users know how they can work around the issue by providing their own reporter with this property set rather than deferring to the default one we create.