Revert "Update base resource for fog-openstack 1.0"

This partially reverts commit 1379c2a8c9 and pins the gem to the latest stable release.

Depends-On: https://review.openstack.org/607683
Change-Id: I70c37040ff3a50f61d738e7a6a3111bcefc15a79

libraries/openstack_base.rb

@@ -18,7 +18,7 @@ module OpenstackclientCookbook
   class OpenstackBase < Chef::Resource::LWRPBase
     require 'fog/openstack'
     def connection
-      @connection_cache ||= Fog::OpenStack::Identity.new(connection_params)
+      @connection_cache ||= Fog::Identity::OpenStack.new(connection_params)
     end
   end
 end

metadata.rb

@@ -12,4 +12,4 @@ version '18.0.0'
   supports os
 end
 
-gem 'fog-openstack', '>= 1.0.0'
+gem 'fog-openstack', '= 0.3.4'