Update readme with links to bug tracker and source
Update readme with links to bug tracker and source

This update is based on the oslo-cookiecutter template for the
README for a new library.

Change-Id: I3ee1e22377e1dcca86ca3d5b208abc3c9dea70a9

mandeepdhami/stevedore,openstack/stevedore,nelsnelson/stevedore,JioCloud/stevedore,varunarya10/stevedore,nelsnelson/stevedore,mandeepdhami/stevedore,varunarya10/stevedore,JioCloud/stevedore