also cleanup of various minix-specific changes, cleanup of mmap-related testing. Change-Id: I289a4fc50cf8a13df4a6082038d860853a4bd024
Instructions on how to use blocktest: 1) compile it by running 'make' 2) read test.sh 3) edit and uncomment one line from test.sh 4) run './test.sh' 5) read the output in /var/log/messages