Add submodule python2-cinderclient

Signed-off-by: Lance Chen <cyen0312@gmail.com>
Add submodule nova

Signed-off-by: Lance Chen <cyen0312@gmail.com>
Add submodule neutron

Signed-off-by: Lance Chen <cyen0312@gmail.com>
Add submodule python2-neutronclient

Signed-off-by: Lance Chen <cyen0312@gmail.com>