Fix iotstrip child device time handling (#1584)

This fixes the time handling of the child devices for iotstrip to
pull from the parent device time module instead of having each child
with its own time module.

tests/iot/test_iotstrip.py

@@ -0,0 +1,44 @@
+from unittest.mock import AsyncMock
+
+from kasa import Module
+from tests.conftest import strip_emeter_iot, strip_iot
+
+
+@strip_iot
+async def test_strip_update_and_child_update_behaviors(dev):
+    await dev.update()
+    await dev.update(update_children=False)
+
+    assert dev.children, "Expected strip device to have children"
+
+    child = dev.children[0]
+    await child.update(update_children=False)
+
+    assert getattr(child, "_features", None)
+
+
+@strip_iot
+async def test_strip_child_delegated_properties(dev):
+    await dev.update()
+    child = dev.children[0]
+
+    assert child.led is False
+    assert child.time == dev.time
+    assert child.timezone == dev.timezone
+
+    na = child.next_action
+    assert isinstance(na, dict)
+    assert "type" in na
+
+
+@strip_emeter_iot
+async def test_strip_emeter_erase_stats(dev, mocker):
+    await dev.update()
+
+    for child in dev.children:
+        energy = child.modules.get(Module.Energy)
+        if energy:
+            mocker.patch.object(energy, "erase_stats", AsyncMock(return_value={}))
+
+    res = await dev.modules[Module.Energy].erase_stats()
+    assert res == {}