openstack-full/monitoring: copy recursively the scripts

Since this commit:
https://github.com/enovance/openstack-monitoring/commit/3ec22e4cf8246e44445fd9f17157348d7aeb8dd1

We have a new directory for each OpenStack project to monitor.
We need to use -r when using "cp" otherwise the copy will fail.

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>