rtslib: Change copyright to Apache License 2.0

This patch converts rtslib code copyright from AGPL to the
permissive Apache License 2.0.

It also update copyright owner to Datera, Inc.

Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
Signed-off-by: Andy Grover <agrover@redhat.com>
Update license for fabric.py

Pulling in relicensing from upstream missed fabric.py, since it's a new
file.

Signed-off-by: Andy Grover <agrover@redhat.com>
Update version to 2.1.37

Signed-off-by: Andy Grover <agrover@redhat.com>