Add submodule keystone

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

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

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

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