'python3 setup.py --name' with the recent pbr started to print
'[pbr] Generating ChangeLog [..]' to stdout, which causes to gather
wrong 'dist_name'. The workaround is to add 'tail -1'.
This should be removed when there is a better way to get dist_name.
Change-Id: Ia519eb8aec4292ab79f285f4cb828b6fbb4421d5
bb686e8deb