liblog: add local_logger

- Create the local-only logger module
- Add LOGGER_LOCAL flag to android_set_log_frontend to enable
- Permit log reader for host compilation

android_set_log_frontend(LOGGER_LOCAL) will result in logs going
into application local memory.  logcat can not retrieve the data,
the user must utilize the log reading interface directly to
acquire their own logs.  Some local logger tests dropped as they
represent testing other liblog facilities.  Other local logger
tests dropped because we make the conscious decision to not
support LOG_ID_SECURITY logging.

ToDo: Some local logger tests dropped because of missing
      functionality associated with blocking reader.

Test: gTest libcutils-tests, logd-unit-tests, liblog-unit-tests,
      logcat-unit-tests, liblog-benchmarks and CtsLiblogTestCases_list
Bug: 27405083
Change-Id: Ia23b932af9e05756eaa60bab9139876b14faf72d