openstack-full/monitoring: copy full dir

Monitoring scripts are not full Python and there is some dependencies
for common code.
It's important to keep the same namespace so let's copy recursively the
scripts to the nagios directory.

For example, nova scripts will go in <nagios-scripts-dir>/nova/*.py etc.

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