fix: what bandit and the remaining lint rules found

- The six except Exception: pass (REST logout, the extra-ports lookup, the
  per-port detail in get_interfaces, closing CLI and REST sessions) now log
  at debug level (B110), so a swallowed failure leaves a trace.
- nosec for comparing a reported address with 0.0.0.0 (B104) and for the
  empty password field of get_users (B105, now a named constant); both are
  false positives.
- A long error message is split into adjacent f-strings; the unused ARP
  entry type is named _entry_type.
- tests: the failed-open test expects ConnectionException instead of any
  Exception; raise ... from exc.

napalm_procurve/api_client.py

@@ -149,7 +149,7 @@ class ProcurveApiClient:
             try:
                 self._session.delete(self._base_url + "login-sessions", timeout=self.timeout)
             except Exception:
-                pass
+                logger.debug("REST API logout: ignored", exc_info=True)
         if self._session:
             self._session.close()
             self._session = None
@@ -283,7 +283,7 @@ class ProcurveApiClient:
                         )
                         seen_ids.add(pid)
         except Exception:
-            pass
+            logger.debug("system/status/switch for missing ports: ignored", exc_info=True)
 
         for port in port_elements:
             pid = port.get("id", "")
@@ -330,7 +330,8 @@ class ProcurveApiClient:
             for entry in ipv4_data.get("ipv4_element", []):
                 addr = entry.get("address", "")
                 mask = entry.get("mask", "")
-                if not addr or addr == "0.0.0.0":
+                # An unset address reported by the switch, not a bind address.
+                if not addr or addr == "0.0.0.0":  # nosec B104
                     continue
                 try:
                     import netaddr