Remove tags and add is_ioc field to host table

Tags were basically only used for IOCs.
Tags were linked to the interface (and not the host).
But for IOC we assume it should always be the main (first) interface.

Using a field on the host table will make it more obvious for users.

Created a IOC dynamic group type, to create a group including all IOCs

JIRA INFRA-862 #action In Progress