liblog: add logprint to host build

- cleanup of some style issues
- resolve a few minor bugs
- add -lrt for host so that clock_gettime can be issued
- enable write-only logging, logprint and event list
  handling tests for host consumption.

NB: CtsLiblogTestCases_list is only outlet for host testing of
    the interfaces, but it is not part of any automated testing

Test: gTest liblog-unit-tests, liblog-benchmarks and
      CtsLiblogTestCases_list && build mmma system/core/liblog
Bug: 27405083
Change-Id: I13db1f45f67569407587a5a909248de33809b8cf