Add generated files to .gitignore.

Change-Id: I609b98d3ffe576313d3206925a03b1657d3fbce9
Update to latest oslo version/setup.

Change-Id: I7bd38b950ef9fea8b6eaa1df599085a1c64d8b61
Merge "Add generated files to .gitignore."
Merge "Update to latest oslo version/setup."