Change the way promote.sh finds the repo directory
Change the way promote.sh finds the repo directory

Currently, promote.sh uses 'find' command to get the full
path to the repository. However, we can predict the path
of the repository, so there is no need to use find for
that wich demands high IO resources.

Change-Id: Ibec74a6703704ef81101f5b6c0708acb5970bd7f

rdo-infra/puppet-dlrn,rdo-infra/puppet-dlrn,javierpena/puppet-delorean,javierpena/puppet-delorean,javierpena/puppet-delorean,rdo-infra/puppet-dlrn