Fetaure: Integrate MySQL, Zipkin Dependencies

[anitsh]

Problem

At the moment the data is stored in memory which
can not be visualized easily. The data gets lost in
every restart. Zipkin provides alternate solutions to
integrate MySQL as storage.
https://github.com/openzipkin/zipkin/blob/master/docker/examples/docker-compose-mysql.yml

The second problem that the current implementation
does not provide the aggregated view of the data, i.e.
the total requests from one end to the other. The
aggregation is done by using zipkin-dependencies,
which is a spark job that aggregates zipkin spans for
use in the UI.
https://github.com/openzipkin/zipkin-dependencies

Solution

I purpose integrating these features which I believe
would add more value to the users in terms of data
visualization as well as understand the entire
application, that includes how Zipkin works. This
solution should not make any change to the sample
applications functionality at all.

As an additional feature this solution will also have
PhpmyAdmin for easier data visualization.

zipkin-dependencies is a cronjob set up to run at
midnight but users can run manually to see the
zipkin_dependency table populated by executin:
docker exec -it --user=root [CONTAINER ID] start-zipkin-dependencies date --date=yesterday +%D

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Motivation

I believe this project is a good example for anyone
who is new in understanding telemetry. As I was
trying to understand Zipkin, it has add great value
to me so I just wished to contribute something. So
I hope this minor enhancement would be useful to
the example community.

Thank you making this open-source 😃.