update TRACKING file

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
write about convention in converting test cases

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
convert Test/simple.sh to Units

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
update TRACKING file

Signed-off-by: Masatake YAMATO <yamato@redhat.com>