feat: read the node's listening sockets through napalm-device-types

ProxmoxDriver mixes in ListeningSocketsMixin (napalm-device-types 2.4.0)
and carries its command over the exec path, which runs as root either
way: whether pveproxy, a Ceph manager or anything else on the node listens
on an address reachable from outside it.

For netOrk#658.

napalm_proxmox/driver.py

@@ -39,6 +39,7 @@ from napalm_device_types import (
     HostStatusMixin,
     HypervisorDriver,
     KernelFactsMixin,
+    ListeningSocketsMixin,
     PortSpec,
     SystemdServicesMixin,
 )
@@ -84,6 +85,7 @@ class ProxmoxDriver(
     ProxmoxRoutingMixin,
     ProxmoxSystemMixin,
     KernelFactsMixin,
+    ListeningSocketsMixin,
     SystemdServicesMixin,
     HostStatusMixin,
     HypervisorDriver,

napalm_proxmox/system_mixin.py

@@ -231,6 +231,15 @@ class ProxmoxSystemMixin:
         """The transport for ``KernelFactsMixin.get_kernel_facts``: the exec path."""
         return self._exec_ssh_command(command)
 
+    # ------------------------------------------------------------------ #
+    # Listening sockets (ListeningSocketsMixin supplies get_listening_sockets)
+    # ------------------------------------------------------------------ #
+
+    def _run_listening_sockets_command(self, command: str, *, privileged: bool) -> str:
+        """The transport for ``ListeningSocketsMixin.get_listening_sockets``:
+        the exec path, which runs as root either way."""
+        return str(self._exec_ssh_command(command))
+
     # ------------------------------------------------------------------ #
     # Packages (Debian APT)
     # ------------------------------------------------------------------ #