Add a TODO for retrying pull request #20
Add a TODO for retrying pull request #20

Sometime in a future retrying version there will
likely/hopefully exist a ability to more easily
filter on specific exceptions; this commit adds a
note to the upstream pull request that may add this
feature.

Change-Id: I44f1c9fe4fbbd5f77032ca7bfff4e2e6b7ff7622

varunarya10/oslo.concurrency,openstack/oslo.concurrency,JioCloud/oslo.concurrency