Support full extended IPS database for FortiGate VMs with eight cores or more 7.2.5

FortiGate VMs with eight or more vCPUs can be configured to have a minimum of eight cores to be eligible to run the full extended database (DB). Any FortiGate VM with less than eight cores will receive a slim version of the extended DB. The slim-extended DB is a smaller version of the full extended DB that contains top active IPS signatures. It is designed for customers who prefer performance.