Add synchronization of configuration for HA hubs.

Synchronize notification_scripts directory to copy notifications scripts
form active to passive hubs.
DON'T use u_rcp for copying files from one hub to another.
Allow access to needed configuration files for all hubs in HA installation.
d'oh - no, actualy, don't do that (even as corrected) - I forgot that this would break policy for 3.5, so needs to be done in a libs/3.6/ file, not here.