Enable delete_key_pair request method and implement it, along with mocking support.

lib/fog/hp/compute.rb

@@ -20,9 +20,10 @@ module Fog
       request :change_password_server
       #request :confirm_resized_server
       request :create_image
-      request :create_server
       request :create_key_pair
+      request :create_server
       request :delete_image
+      request :delete_key_pair
       request :delete_server
       request :get_flavor_details
       request :get_image_details

lib/fog/hp/requests/compute/delete_key_pair.rb

@@ -0,0 +1,34 @@
+module Fog
+  module Compute
+    class HP
+      class Real
+
+        # Delete a keypair
+        #
+        # ==== Parameters
+        # * key_name<~String> - Name of the keypair to delete
+        #
+        def delete_key_pair(key_name)
+          request(
+            :expects  => 202,
+            :method   => 'DELETE',
+            :path     => "os-keypairs/#{key_name}"
+          )
+        end
+
+      end
+
+      class Mock
+
+        def delete_key_pair(key_name)
+          response = Excon::Response.new
+          self.data[:key_pairs].delete(key_name)
+          response.status = 202
+          response.body = "202 Accepted\n\nThe request is accepted for processing.\n\n   "
+          response
+        end
+
+      end
+    end
+  end
+end