Remove workaround when Kea dhcp4 fails to open socket

[sarcasticadmin]

Description

Related to: #670

Upstream issue: https://gitlab.isc.org/isc-projects/kea/-/issues/2776

I was having an issue running microvm with qemu and the kea dhcp4 service not binding to all interfaces. It would be ok if I restarted the service but it wouldnt come up cleanly on its own. Even after trying to add additional requirements/deps to the unit file nothing seemed to work. The following workaround was the only thing that seems to resolve the issue:

"interfaces-config": {
        ...
        "service-sockets-max-retries": 5,
        "service-sockets-retry-wait-time": 5000
    },

See:

scale-network/facts/inventory.py

Lines 445 to 449 in c6e657d

	"interfaces-config": {
	"interfaces": ["*"],
	"service-sockets-max-retries": 5,
	"service-sockets-retry-wait-time": 5000
	},

There are other related issues to this:

• https://gitlab.isc.org/isc-projects/kea/-/issues/1084
• https://gitlab.isc.org/isc-projects/kea/-/issues/3188

Acceptance Criteria

• Ensure fix is working in newer versions of kea
• Remove the need for the service-sockets-* to be declared in kea dhcp4 config