Allow multiprocess on destral execute

[jaumef]

Execute destral with multiprocess on 1 process:

1. Create a multiprocessing pool
2. Queue destral for each affected module
3. Run the queued processes with multiprocessing

• On Circle-CI only 1 process, so the output won't be messed up
• Without attending Output, we could multi-process it
• The return value of the multiprocesses would be the JUnit so we can get all the data from those runs

PROS:

• No python imports on vars would be affected on multi-module tests
• No DB side-effects on multi-module tests (each run would have a new DB)