liblog: test: __android_log_error_write accuracy

Add a test to confirm exact expected content using the testframe
setup for the events log handler. Remove dependency on 512 truncation
in liblog->
android_errorWriteWithInfoLog__android_logger_list_read__data_too_large
to something more liberal.

Bug: 27356456
Change-Id: I8a53ad3a16cf16b14856efe5b95417e857c7e09b