Add os-xenapi to rdoinfo
Add os-xenapi to rdoinfo

os-xenapi is a XenAPI library for OpenStack projects. It is currently
being used at least by Nova and Neutron, and has recently become a
build requirement for Neutron [1].

Package review is in https://bugzilla.redhat.com/show_bug.cgi?id=1439595

[1] https://review.openstack.org/402330

Change-Id: Icc87ea7a8f78ee2de013f06d395ae76cca330083

javierpena/rdoinfo,redhat-openstack/rdoinfo