fix(get_config): use netmiko hp_procurve on port 22

HP ProCurve needs invoke_shell (not exec_channel) — exec_command via
paramiko returns 'SSH command execution is not supported'. Netmiko's
hp_procurve device type handles this correctly. Port 22 explicit.

napalm_procurve/procurve.py

@@ -592,34 +592,21 @@ class ProcurveDriver(ConfigLifecycleMixin, SwitchDriver):
         return {"running": running, "startup": startup, "candidate": candidate}
 
     def _get_config_via_ssh(self) -> str:
-        """Open a one-shot SSH session on port 22 to retrieve running-config.
+        """Retrieve running-config via netmiko on port 22.
 
-        Used when the REST API does not expose the running-config endpoint
-        (e.g. HP 2530 / YA firmware).  Uses port 22 explicitly because
+        HP ProCurve switches do not support exec_channel SSH; they require
+        an interactive shell (invoke_shell), which netmiko's hp_procurve
+        device type handles correctly.  Port 22 is used explicitly because
         self.port is the REST API port (443) in API transport mode.
         """
-        import paramiko
-
-        _TIMEOUT = 15
-
         try:
-            client = paramiko.SSHClient()
-            client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
-            client.connect(
-                hostname=self.hostname,
-                port=22,  # always SSH — self.port is the REST API port
-                username=self.username,
-                password=self.password,
-                timeout=_TIMEOUT,
-                banner_timeout=_TIMEOUT,
-                auth_timeout=_TIMEOUT,
-                look_for_keys=False,
-                allow_agent=False,
-            )
-            _, stdout, _ = client.exec_command("show running-config", timeout=_TIMEOUT)
-            config = stdout.read().decode("utf-8", errors="replace")
-            client.close()
-            return config
+            kwargs = self._netmiko_kwargs()
+            kwargs["port"] = 22  # always SSH — self.port is the REST API port
+            conn = ConnectHandler(**kwargs)
+            try:
+                return conn.send_command("show running-config")
+            finally:
+                conn.disconnect()
         except Exception as exc:
             logger.warning("SSH config fallback failed for %s: %s", self.hostname, exc)
             return ""