feat!: fix templates with the caller's values replace run_device_action (0.3.0)

fix_snmp overwrote snmpd.conf with an application's values (community
"public", "Managed by netOrk", netork@localhost) through a fixed
/tmp/netork_snmpd.conf, and opened ufw for a /24 guessed from ss;
install_lldpd was an action of its own. Neither read an exit status.

The driver implements napalm-device-types 4.13's templates instead:
- configure_snmp_agent(settings): net-snmp installed, snmpd.conf with
  one rocommunity line per allowed source (mktemp, install as root),
  ufw opened for those sources only (pve-firewall stays the
  operator's), snmpd enabled and restarted;
- get_management_peer() from SSH_CONNECTION;
- install_package(name), as the contract says (raises when apt fails),
  so ensure_package comes from the base package.
Every step reads its exit status.

BREAKING CHANGE: run_device_action is removed. Requires
napalm-device-types 4.13.

Part of #24.

napalm_proxmox/driver.py

@@ -35,12 +35,14 @@ from typing import Any
 logger = logging.getLogger(__name__)
 
 from napalm_device_types import (
+    EnsurePackageMixin,
     FingerprintRule,
     HostStatusMixin,
     HypervisorDriver,
     KernelFactsMixin,
     ListeningSocketsMixin,
     PortSpec,
+    SnmpAgentMixin,
     SystemIdentityMixin,
     SystemdServicesMixin,
 )
@@ -90,6 +92,8 @@ class ProxmoxDriver(
     SystemIdentityMixin,
     SystemdServicesMixin,
     HostStatusMixin,
+    SnmpAgentMixin,
+    EnsurePackageMixin,
     HypervisorDriver,
 ):
     """NAPALM driver for Proxmox VE nodes."""