python-six dependency blocking Humble release

[dcconner]

python-six dependency introduced in team-vigir/flexbe_behavior_engine#102
Is causing issues for Humble release on RHEL.

Repeating question posted there for @pschillinger @fmessmer

What does six.moves.queue have over standard queue module?

I'd like to go back to queue to avoid issue on ROS 2 release as RHEL does not have python-six.
Or is there some reason for python-six and I should:

• just drop RHEL?
• try to convert dependency to python3-six?

[fmessmer]

back then (Jan 2020), these changes were made with python2/python3 compatibility in mind, IIRC

the changes were produced by running 2to3 -wn .

pylint reported issues and 2to3 suggested these changes...

I guess python2 is no longer relevant anymore...