Feature/test parallel docker compose

Merged Peio Rigaux requested to merge feature/test_parallel_docker-compose into master

Enabled parallel docker-compose testing.

Flexisip image is now build at build stage, and will take [branch]-[commit] name

A CRON job is set to clean old images weekly.

Tests were run in the same time on Feature/test_parallel_docker_compose and Feature/test_parallel_docker_compose2

Edited by Peio Rigaux

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