Update nokogiri gem when installing deface-based plugins

deface < 1.0 has a dependency on ~> 1.5.0 which conflicts
with the 1.6.x gem installed by default in core.
hammer-cli updated to 0.1.1
hammer-cli-foreman updated to 0.1.1
Update kafo to 0.6.0
Update to foreman_bootdisk 2.0.7
refs #5793 - distribute VERSION
Update to foreman_bootdisk 2.0.8
Update kafo_parsers to 0.0.3
discovery: release 1.3.0
Update kafo to 0.6.1
Pin librarian on as it's now 1.9 only
Update kafo to 0.6.3
Add bundler_ext 0.4 for all debian OSs
Convert proxy to use bundler_ext
Migrate old proxy settings if upgrading from old monolithic setup
fix syntax error in migration
Update kafo to 0.6.4