feat(vm-provision): declare the guest agent per guest OS, Linux only

Follows napalm-device-types 3.0, which replaces GUEST_AGENT_PACKAGES /
GUEST_AGENT_RUNCMD with GUEST_AGENTS = {guest_os: (packages, runcmd)}.
VMware lists Linux with open-vm-tools, as before, and refuses any other
guest_os before anything is created: BSD guests on VMware are optional
for now (NetOrk/netork#801).

The NoCloud network-config moved to napalm-device-types
(`provisioning.network_config`), which Proxmox now uses as well; the seed
module's copy is gone, and the tests check that the generic one is used.

tests/test_provision_seed.py

@@ -6,8 +6,11 @@ import io
 
 import pycdlib
 import yaml
+from napalm_device_types import provisioning as generic
 
-from napalm_vmware.provision.seed import meta_data, network_config, nocloud_iso, user_data
+from napalm_vmware import provisioning as prov
+from napalm_vmware.provision import seed
+from napalm_vmware.provision.seed import meta_data, nocloud_iso, user_data
 
 
 class TestUserData:
@@ -34,17 +37,13 @@ def test_meta_data():
 
 
 class TestNetworkConfig:
-    def test_dhcp_nics_matched_by_mac(self):
-        cfg = network_config([("00:50:56:aa:bb:cc", True), ("00:50:56:aa:bb:dd", False)])
-        assert cfg == {
-            "version": 2,
-            "ethernets": {
-                "nic0": {"match": {"macaddress": "00:50:56:aa:bb:cc"}, "dhcp4": True},
-            },
-        }
+    """Written by napalm-device-types, which Proxmox uses as well (NetOrk/netork#794)."""
 
-    def test_no_dhcp_nic_means_no_network_config(self):
-        assert network_config([("00:50:56:aa:bb:cc", False)]) is None
+    def test_the_seed_is_built_with_the_generic_network_config(self):
+        assert prov.network_config is generic.network_config
+
+    def test_no_copy_of_it_is_left_here(self):
+        assert not hasattr(seed, "network_config")
 
 
 def _read(iso: bytes, name: str) -> str: