If you would like to contribute to the development of oslo's libraries, first you must take a look to this page:
If you would like to contribute to the development of OpenStack, you must follow the steps in this page:
Once those steps have been completed, changes to OpenStack should be submitted for review via the Gerrit tool, following the workflow documented at:
Pull requests submitted through GitHub will be ignored.
Bugs should be filed on Launchpad, not GitHub: