Add neutron client utilities for wrapper class:
neutron client configuration
neutron admin token utils
neutron client wrapper class
Change-Id: I22290d75a6628491c25c7b4cbd0cdfa4a2ab6749
Co-Authored-By: Yi Yang <yyos1999@gmail.com>
Co-Authored-By: Yapeng Wu <yapengwu@gmail.com>
Signed-off-by: Yapeng Wu <yapengwu@gmail.com>