Use fog/rackspace instead of fog

Fog is the old school monolithic gem which has been replaced. This gem
loads MUCH faster and brings in fewer deps, which keeps installs nice
and small

Signed-off-by: Tim Smith <tsmith@chef.io>

knife-rackspace.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }
   s.add_dependency "knife-windows"
-  s.add_dependency "fog", ">= 1.35"
+  s.add_dependency "fog-rackspace", ">= 0.1"
   s.add_dependency "chef", ">= 12.0"
   s.require_paths = ["lib"]
 end

lib/chef/knife/rackspace_base.rb

@@ -17,7 +17,7 @@
 #
 
 require "chef/knife"
-require "fog"
+require "fog/rackspace"
 
 class Chef
   class Knife
@@ -30,7 +30,7 @@ def self.included(includer)
         includer.class_eval do
 
           deps do
-            require "fog"
+            require "fog/rackspace"
             require "net/ssh/multi"
             require "readline"
             require "chef/json_compat"

lib/chef/knife/rackspace_server_create.rb

@@ -29,7 +29,7 @@ class RackspaceServerCreate < Knife
       include Chef::Knife::WinrmBase
 
       deps do
-        require "fog"
+        require "fog/rackspace"
         require "readline"
         require "chef/json_compat"
         require "chef/knife/bootstrap"