power_WakeSources: clarify log message

Previously log message does not differentiate between full
and dark resumes. Clarify this.

BUG=None
TEST=print out:
Testing wake by USB_KB triggers a full wake when dark resume
is enabled.
Testing wake by AC_DISCONNECTED triggers a dark wake when
dark resume is enabled.

Change-Id: Ic305e9487914529d45894307ba62d61137903ee4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/3027455
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Derek Basehore <dbasehore@chromium.org>
Commit-Queue: Mengqi Guo <mqg@chromium.org>
Tested-by: Mengqi Guo <mqg@chromium.org>
Auto-Submit: Mengqi Guo <mqg@chromium.org>
diff --git a/server/site_tests/power_WakeSources/power_WakeSources.py b/server/site_tests/power_WakeSources/power_WakeSources.py
index 5c0d588..f131c2e 100644
--- a/server/site_tests/power_WakeSources/power_WakeSources.py
+++ b/server/site_tests/power_WakeSources/power_WakeSources.py
@@ -258,8 +258,8 @@
         """
         is_success = True
         logging.info(
-            'Testing wake by %s triggers a '
-            'full wake when dark resume is enabled.', wake_source)
+                'Testing wake by %s triggers a %s wake when dark resume is '
+                'enabled.', wake_source, 'full' if full_wake else 'dark')
         if not self._before_suspend(wake_source):
             logging.error('Before suspend action failed for %s', wake_source)
             # Still run the _after_resume callback since we can do things like