Add third party nasl to OpenVAS/GVM

[cfi]

@Hani

There is one important caveat though: GVMd rebuilds the cache automatically, but only when the plugin feed version has changed, ie. In plugins/plugin_feed_info.inc, increase PLUGIN_SET value before you reload/restart openvassd.

It is also possible to trigger a rebuild of the manager via SQL commands:

PostgreSQL

psql -q --pset pager=off gvmd -c "DELETE FROM meta where name = 'nvts_feed_version' OR name = 'nvts_check_time';" 

SQLite

/usr/bin/sqlite3 /path/to/var/lib/gvm/gvmd/gvmd.db "DELETE FROM meta where name = 'nvts_feed_version' OR name = 'nvts_check_time';"