Make shef try to load current knife config by default

shef.rb

# ~/.chef/shef.rb
begin
  # Load configuration from knife.rb
  require 'chef/knife'
  Chef::Knife.new.configure_chef
rescue
  puts <<-EOF
Can't load knife config: #{$!}
This is probably nothing serious.
  EOF
else
  # monkey-patch Shef to prevent it from setting Chef::Config[:solo] to true
  class Shef::StandAloneSession
    alias_method :rebuild_node_orig, :rebuild_node
    def rebuild_node
      rebuild_node_orig
      Chef::Config[:solo] = false
    end
  end
end