automake cleanup: moving misc tools to tools subdir

Signed-off-by: Roald J. van Loon <roaldvanloon@gmail.com>
automake cleanup: moving rados tool to tools subdir

Signed-off-by: Roald J. van Loon <roaldvanloon@gmail.com>
automake cleanup: renaming buildtest

The previous name could cause confusion (it's not only used to test
build libcommon anymore).

Signed-off-by: Roald J. van Loon <roaldvanloon@gmail.com>