Add fog 1.21 deps (core, json)

http://koji.katello.org/koji/buildinfo?buildID=8699 (fog-core el6)
http://koji.katello.org/koji/buildinfo?buildID=8700 (fog-core f19)

http://koji.katello.org/koji/buildinfo?buildID=8694 (fog-json el6)
http://koji.katello.org/koji/buildinfo?buildID=8695 (fog-json f19)

fog 1.21.0 and excon are already built, just need these for repoclosure.