liblog: tests: __security and enoent failures

- __security test to allow 20ms resting time after setting ro.device_owner
- enoent test resort to using "su" command if we are not root to start
  and stop the logger.
- Add some instrumentation to guide us in the future if issues.

Test: gTest liblog-unit-tests
      cts-tradefed run cts -m CtsLiblogTestCases
Bug: 36232924
Change-Id: I6b926a1913497f7e6204493fc744ee6c454a5ce4