Update fedora-rdo-icehouse element

This patch takes advantage of the refactoring of the rdo-icehouse
and enable-packages-install bits.  The reactoring allows other
redhat family os elements also use rdo-icehouse and
enable-packages-install.

This patch also deprecates the fedora-rdo-icehouse-repository element
and removes the dependency on it from fedora-rdo-icehouse.

Change-Id: I4e2391d987a05163bc7d45ad03f80c9f6d555681
Merge "Update fedora-rdo-icehouse element"