fix: what bandit and the remaining lint rules found

- driver.py: the logger is defined after the imports (E402). The lazy
  paramiko client is annotated Any, as _node_ssh already is; the quoted
  paramiko.SSHClient named a module that is never imported there (F821).
- Unused locals are gone: get_facts' hostname, get_users' groups (both
  read a value nobody used), the ARP flags column is _flags; the output is
  unchanged.
- Long lines are wrapped: the apt-get and snmpd.conf commands are split
  into adjacent string literals, the power-action error message and the
  system mixin's docstring are wrapped; the text is unchanged.
- get_vm_status re-raises with raise ... from e (B904).
- The two except Exception: pass (closing the SSH session, the is_alive
  probe) now log at debug level (B110), so a swallowed failure leaves a
  trace.
- nosec for the empty "password" field of NAPALM's get_users shape and
  the ssh_password_auth flag (B105); all three are false positives.
- tests: unused loop variables.

napalm_proxmox/driver.py

@@ -32,8 +32,6 @@ from __future__ import annotations
 import logging
 from typing import Any
 
-logger = logging.getLogger(__name__)
-
 from napalm.base.exceptions import ConnectionException
 from napalm_device_types import (
     AptProxyMixin,
@@ -68,6 +66,8 @@ from napalm_proxmox.vm_mixin import ProxmoxVMMixin
 from napalm_proxmox.vm_provision_mixin import ProxmoxVMProvisionMixin
 from napalm_proxmox.vm_snapshot_mixin import ProxmoxVMSnapshotMixin
 
+logger = logging.getLogger(__name__)
+
 # --------------------------------------------------------------------------- #
 # Type aliases
 # --------------------------------------------------------------------------- #
@@ -156,7 +156,8 @@ class ProxmoxDriver(
 
         self._api: ProxmoxAPI | None = None
         self._node_name: str = ""
-        self._ssh_client: paramiko.SSHClient | None = None
+        # paramiko.SSHClient; paramiko is imported lazily (see _node_ssh).
+        self._ssh_client: Any = None
 
         # Candidate config (merge/replace)
         self._candidate_config: str = ""
@@ -257,7 +258,7 @@ class ProxmoxDriver(
             try:
                 self._ssh_client.close()
             except Exception:
-                pass
+                logger.debug("%s: closing the SSH session: ignored", self.hostname, exc_info=True)
             self._ssh_client = None
 
     def is_alive(self) -> _JsonDict:
@@ -274,7 +275,7 @@ class ProxmoxDriver(
                 self._api.version.get()
                 alive = True
             except Exception:
-                pass
+                logger.debug("%s: liveness probe failed", self.hostname, exc_info=True)
         return {"is_alive": alive}
 
     # ------------------------------------------------------------------ #
@@ -432,7 +433,6 @@ class ProxmoxDriver(
 
         uptime = float(status.get("uptime", 0))
         dns_search = dns.get("search", "")
-        hostname = self._node_name
         fqdn = f"{self._node_name}.{dns_search}" if dns_search else self.hostname
 
         iface_list = sorted(iface["iface"] for iface in network if iface.get("iface"))