Fix openstack-api-programming Jenkins job.

Fixes bug 1185966

The FTP source path was wrong in the openstack-api-programming job. It
was trying to copy from a source path that does not exist. Use the
correct path.

Change-Id: I89d664e44cd4df64998731565ba96882c11feece
Reviewed-on: https://review.openstack.org/31680
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins