tests: Add example test using power_control plugin

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

test/functional/tests/example/example_test_power_cycle.py

@@ -0,0 +1,26 @@
+#
+# Copyright(c) 2020 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+#
+
+import pytest
+from core.test_run import TestRun
+from storage_devices.disk import DiskType, DiskTypeSet
+
+
+@pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
+@pytest.mark.require_plugin("power_control")
+def test_create_example_partitions():
+    """
+        title: Example test doing power cycle
+        description: |
+          Example usage of power_control plugin.
+          NOTE:
+          This test uses plugin that is not included in test-framework.
+          It should be provided by user as external_plugin.
+        pass_criteria:
+          - DUT should reboot successfully.
+    """
+    with TestRun.step("Power cycle DUT"):
+        power_control = TestRun.plugin_manager.get_plugin('power_control')
+        power_control.power_cycle()