Docker performance tuning

[rahul286]

This may need changes in Dockerfiles or ee installer/core. To be decided after research:

We haven't encountered any issue but it's good to do a performance check sooner than later:

1. https://wiki.mikejung.biz/Docker#MySQL_Docker_Performance_Benchmarks
2. MySQL extremely slow just with docker-ce installed docker/for-linux#247 (comment)