Profile `icingaweb2_dev': deduplicate DB creation/population

refs #6842
Profile `icingaweb2_dev': outsource Icinga Web 2 config file provision into (new) `define's

icingaweb2::config
icingaweb2::config::monitoring

refs #6842
Profile `icingaweb2_dev': softcode '/etc/icingaweb' as $cfgpath

refs #6842
Rename `icingaweb2::config::monitoring' to `icingaweb2::config::module'

refs #6842
Profile `icingaweb2_dev': add config file 'resources.ini'

refs #6842