rstrip! the endpoint as well

I kept getting bad URI error when loading the endpoint from a file because there was a trailing newline. This fixes that problem.

src/oca/ruby/opennebula/client.rb

@@ -143,6 +143,8 @@ module OpenNebula
             else
                 @one_endpoint = "http://localhost:2633/RPC2"
             end
+            
+            @one_endpoint.rstrip!
 
             @async = !options[:sync]