This directory contains eggs that were downloaded by setuptools
to build, test, and run plug-ins.
This directory caches those eggs to prevent repeated downloads.
We need to ignore it.
Change-Id: Idd164c7c8952c70487253e5691ba2da33345059a
Running the tests installs pbr in a way that leaves a .egg directory in
the source tree, so update the ignore file to ignore it.
Change-Id: I7d702c9511992efc518195def0967bc0191d93a9