change default port to 5002

[friendtocephalopods]

Summary of Changes

Change the default port to 5002. Currently all wsgi try to start up with the default port, so it's easier/free to start up all 3 servers for local debugging if they each have a different port.

This is kind of speculative -- WDYT? If ya'll are like us, you've customized the port for your individual circumstances anyway, but if you're expecting the port to be 5000, this will cause some problems...

Tests

Config/port change. No tests affected.

Documentation

Changed port number to 5002.

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[feng-tao]

I think it make sense as internally we custom the port as well. But I think we need to update all the docker file(e.g https://github.com/lyft/amundsen/blob/master/docker-amundsen.yml#L50) as it still refers to port 5000 and convert it to 5002.

Otherwise I think it will break if user use docker-compose file.

[codecov-io]

Codecov Report

Merging #102 into master will decrease coverage by 2.77%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   72.65%   69.88%   -2.78%     
==========================================
  Files          23       21       -2     
  Lines        1119     1016     -103     
  Branches      116      106      -10     
==========================================
- Hits          813      710     -103     
  Misses        279      279              
  Partials       27       27

Impacted Files	Coverage Δ
metadata_service/metadata_wsgi.py	0% <0%> (ø)	⬆️
metadata_service/proxy/atlas_proxy.py	85.08% <0%> (ø)	⬆️
metadata_service/proxy/neo4j_proxy.py	73.43% <0%> (ø)	⬆️
metadata_service/entity/user_detail.py
metadata_service/entity/table_detail.py

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