Katello Dev Environment Update

For anyone with an existing development environment, the next time you pull
master of Katello you may notice an error about 'katello.local.rb'. This is
a result of removing this file. While the devel module needs updating, you
can fix your local setup by:

cd foreman/bundler.d
unlink katello.local.rb
echo "gemspec :path => '…/katello', :development_group => :katello_dev" >