hw-info only storing keys from `match_nodes_on` config

When a node gets identified, only the hw_info that is used to identify the node is stored on the node. By default, only the mac (which comes from the netX properties) get stored:

[root@puppet-razor-01 /]# razor nodes node1 hw_info

From https://localhost:8151/api/collections/nodes/node1:

  mac: [01-01-01-01-01-01]

That makes things more complicated when you want to change how you identify a node. Instead, all properties that iPXE sends should be recorded for future usage and lookup.

The fix for this should work retroactively for nodes already in a system when they reboot. Out of scope. This will be done via set-node-hw-info.