Update Docker run commands and fix shadowsocks python edition service start command

[alexzhangs]

This pull request updates the Docker run commands in the README.md file to remove the port mappings for memcached and rabbitmq containers.

It also fixes the shadowsocks python edition service start command in the models.py file by setting a random password and using a non-standard server port.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.76%. Comparing base (1602373) to head (c812dfd).
Report is 9 commits behind head on master.

❗ Current head c812dfd differs from pull request most recent head 2f875df. Consider uploading reports for the commit 2f875df to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   86.73%   86.76%   +0.02%     
==========================================
  Files          81       81              
  Lines        3769     3777       +8     
==========================================
+ Hits         3269     3277       +8     
  Misses        500      500              

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