libcircle: initial add

Signed-off-by: Jimmy Tang <jcftang@gmail.com>
attr: initial add of libattr

Signed-off-by: Jimmy Tang <jcftang@gmail.com>
dcp: distributed copy initial add

Signed-off-by: Jimmy Tang <jcftang@gmail.com>
Merge pull request #458 from jcftang/dcp

Dcp - distributed copy