Changed .gitignore to ignore all .egg files, not just .egg-info files.

Change-Id: I6b0ca4813af65f6c76da5997121cb2c4d964005d
Reviewed-on: https://review.openstack.org/24346
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins