liblog: add __android_log_config_*_close()

Add __android_log_config_read_close() and
__android_log_config_write_close().  Fortify the list macros
to detect for list corruption, looking for entries pointing
to themselves, deleted entries in list.

Test: gTest liblog-unit-tests
Bug: 27405083
Change-Id: I33e8a0cae7e202f1989ddd7c2a96752b44c8e746