Add jlibosva and nmagnezi to Neutron* maintainers
Add jlibosva and nmagnezi to Neutron* maintainers

I also added majopela to neutron-lib to sync with all other Neutron
projects.

Change-Id: Iceef032e4a4e2a8dec29b56a85b101eacac5a975

redhat-openstack/rdoinfo,javierpena/rdoinfo