fix: what bandit and the remaining lint rules found

- Netgear Plus: a failed logout on close() now logs at debug level (B110),
  so a swallowed failure leaves a trace; the module gets its logger.
- nosec for the firmware CDN probe (B310): the URL is built on the fixed
  https base _FW_CDN_BASE, model and version only fill its path, so no
  file:// or custom scheme can reach urlopen.
- nosec for the empty password in get_users (B105): it is NAPALM's field,
  the CLI never shows a password; a false positive.
- The v7 LLDP table in a docstring loses one leading space per line to fit
  line length 100.
- tests: a second TestGetLldpNeighbors class shadowed the first, whose two
  tests never ran; the v7 one is now TestGetLldpNeighborsV7 and both run
  (and pass). raise ... from exc in the netmiko stand-in.

tests/unit/test_driver.py

@@ -745,7 +745,7 @@ GS110TPv3#
 """
 
 
-class TestGetLldpNeighbors:
+class TestGetLldpNeighborsV7:
     """`show lldp neighbor` — the switch does speak LLDP, the driver did not.
 
     Without this the map has nothing to draw for the site this switch serves:

tests/unit/test_ssh_host_key.py

@@ -76,7 +76,7 @@ def test_a_changed_key_is_refused():
         try:
             raise paramiko.BadHostKeyException("10.0.0.8", SERVER_KEY, OTHER_KEY)
         except paramiko.SSHException as exc:  # what netmiko does with it
-            raise NetmikoTimeoutException(f"A paramiko SSHException occurred: {exc}")
+            raise NetmikoTimeoutException(f"A paramiko SSHException occurred: {exc}") from exc
 
     driver = _driver(seen, SshHostKey.of(OTHER_KEY))
     with patch(HANDLER, side_effect=refuse):