Add strigazi as RDO package maintainer for magnum and magnumclient
Add strigazi as RDO package maintainer for magnum and magnumclient

* strigazi is a core-reviewer on OpenStack Magnum project and he helped
  us a lot on RDO magnum packages.

It would be great to have him onward for the same.

Change-Id: Ic5e0b156e39800be5b97ac23e7c2355abf1dcdd8

redhat-openstack/rdoinfo,javierpena/rdoinfo