display_db.py shows the output of the REST interface in a format a human can read
configure.py is now a python3 script
it also produces a description of 3 hostgroups - one per subnet type
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nagios seems to have some predefined groups of its own that should probably be trashed
push nagios hostgroups definition file
inject-json.sh waits for 5s seconds after omf-sfa gets restarted, and this allows create_resource to do its job properly