Move slave scripts to new slave script location

We apparently didn't rebase all changes properly and some new scripts
ended up in jenkins/files/slave_scripts when they should all go into
openstack_project/files/slave_scripts. Move them now.

Change-Id: If6eec70f9da393193497d4d52d6a69a34cdb4db2
Merge "Move slave scripts to new slave script location"