Adds aggregateWithWildcards (and sum / multiply / avg)

[robert-milan]

This PR adds aggregateWithWildcards and sumSeriesWithWildcards, multiplySeriesWithWildcards, and averageSeriesWithWildcards

I have tested it locally against sumSeries, averageSeries, and multiplySeries and it appears to be working properly.

[Dieterbe]

in docker-dev, issuing this query averageSeriesWithWildcards(perSecond(metrictank.stats.docker-env.default.api.request.*.status.*.counter32), 6)

on graphite, I get these 2 series:

perSecond(metrictank.stats.docker-env.default.api.request.status.200.counter32)
perSecond(metrictank.stats.docker-env.default.api.request.status.404.counter32)

on MT, I get:

averageSeries(metrictank.stats.docker-env.default.api.request.status.200.counter32)
averageSeries(perSecond(metrictank.stats.docker-env.default.api.request.*.status.*.counter32))

[Dieterbe]

@robert-milan I added some commits. now it seems to work like graphite in all my tests.
I think it's good now. what do you think?
I have used this dashboard for testing: https://gist.github.com/Dieterbe/f7f9375aafa2173923c5250224f73e7e

[shanson7]

FWIW I used https://github.com/shanson7/mtcmptest to compare MT and graphite responses

[robert-milan]

Thanks Dieter, looks good.