Add rubygem-ipaddress dep for fog 1.23.0

Source: Fedora
Add rubygem-fog-softlayer dep for fog 1.23.0
Rebase to excon 0.38.0
Update to v1.23.0
Rebase to fog 1.23.0
refs #6670 - Update fog to 1.23
Merge pull request #285 from domcleal/rpm/develop-6670-fog-1.23

refs #6670 - Fog 1.23