fix: do not claim update reading or applying QTS cannot do

QTS has no apt, dnf or opkg, so the update readers inherited from
LinuxDriver find no package manager, and QPKG updates are not implemented.
get_available_updates, refresh_available_updates and apply_updates are None,
the same opt-out as manage_service: netOrk's patch groups and compliance
report include a driver only when these are callable.

napalm_qnap_qts/qnap_qts.py

@@ -68,6 +68,17 @@ class QnapQtsDriver(StorageDriver, HypervisorDriver, LinuxDriver):
     driver_name = "qnap_qts"
     NETMIKO_DEVICE_TYPE = "linux"
 
+    #: QTS has no systemd, so the systemctl actions LinuxDriver inherits from
+    #: napalm-device-types' SystemdServicesMixin would fail on every unit. None
+    #: makes every "can it control services?" check -- is ``manage_service``
+    #: callable -- answer no, rather than offering buttons that cannot work.
+    manage_service = None  # type: ignore[assignment]
+    #: The same for updates: QTS has no apt, dnf or opkg, and QPKG updates are
+    #: not implemented. netOrk leaves a driver without them out of patching.
+    get_available_updates = None  # type: ignore[assignment]
+    refresh_available_updates = None  # type: ignore[assignment]
+    apply_updates = None  # type: ignore[assignment]
+
     SNMP_OBJECT_ID_PREFIX = QNAP_ENTERPRISE_OID
     SNMP_FINGERPRINT = [
         FingerprintRule("qnap", weight=9.0),

tests/test_qnap_qts.py

@@ -182,3 +182,23 @@ class TestDockerBinDiscovery:
     def test_docker_bin_hook_returns_the_discovered_path(self, driver):
         driver._docker_path = "/opt/docker"
         assert driver._docker_bin() == "/opt/docker"
+
+
+def test_services_cannot_be_controlled():
+    """QTS has no systemd: the systemctl actions inherited from LinuxDriver would
+    fail on every unit, so the driver says it cannot control services at all --
+    which is what every capability check asks (is ``manage_service`` callable?)."""
+    from napalm_linux.linux import LinuxDriver
+
+    assert callable(getattr(LinuxDriver, "manage_service", None))
+    assert not callable(getattr(QnapQtsDriver, "manage_service", None))
+
+
+
+def test_updates_are_not_read_or_applied_here():
+    """QTS has no apt, dnf or opkg: the readers inherited from LinuxDriver find no
+    package manager, and QPKG updates are not implemented. Saying so keeps QNAP out
+    of netOrk's patch groups and compliance report, which ask whether these
+    methods are callable."""
+    for method in ("get_available_updates", "refresh_available_updates", "apply_updates"):
+        assert not callable(getattr(QnapQtsDriver, method, None)), method