Fix parallel build issue for puppet modules
Fix parallel build issue for puppet modules

When we build two puppet modules at the same time, and their version
number is exactly the same, there is a small window where one of
the builds could fail. This is because the build_srpm.sh script,
which runs on the source repo, creates a tarball named ${VERSION}.tar.gz
on the parent directory, where both builders could collide.

This commit fixes this by creating the tarball in a unique directory
for each builder.

Change-Id: I9cd09cb58f7c009b1ac54871cb0761fe9dd18768

openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/delorean,openstack-packages/DLRN