Add Yatin Karel as a package maintainer for Magnum projects
Add Yatin Karel as a package maintainer for Magnum projects

* Yatin Karel aka ykarel on IRC has done an awesome job on packaging
  side and is also core reviewer for Magnum project upstream.
  It would be great to have him here.

 Thank you Yatin for all the hard work. :-)

Change-Id: I7bf4bfdf0d545d340717b9f861c188445df6a566

redhat-openstack/rdoinfo,javierpena/rdoinfo