Introduce Env variable QA_DOCKER_ADD_HOSTS
What does this MR do and why?
In order to override some host in docker container when test runs. JH team found some host(google GA, gravatar) is not stable on our side, so need override /etc/hosts in docker container to block them to make sure tests are running smoothly.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
/cc @daveliu
Edited by George Koltsov