Add Get register api implementation in framework

the openstack plugin have implemented the api, so we also need to
implement it in the framework, then user can call it

Issue-ID: MULTICLOUD-740
Signed-off-by: Haibin Huang <haibin.huang@intel.com>
Change-Id: I16bc23dffd15e0d7a21d6ace090757a8f444e14f
1 file changed