We've seen release job failures caused by too large tarball, which
contains irrelevant files like git history.
Let's exclude these files to reduce size of the archive.
The file is copied from the puppetlabs repositories with some files
specific to OpenStack projects added.
Change-Id: Ie9a6706e1977efafcaad799ac6a68a966c9bb693
(cherry picked from commit 6ab903b68ad0bc42b5122f07d2f60d01c88776b1)
