2021-May-30 - Prerelease - 2.6.216

Speed up ansible execution via mitogen and disable gather facts (#9304)

Mitogen is a faster pipelining strategy that offers
significant speed-ups.

Documentation available at:
<https://mitogen.networkgenomics.com/ansible_detailed.html>

Second, fact gathering is needed only if 'fact' variables are needed.
We do not use any, we can skip the gather facts phase.