M #-: Avoid error reporting exception in vcenter

At the time of loading vcenterrc, if someting goes wrong
it tries to log the error using a non defined error_message
function

src/vmm_mad/remotes/vcenter/vcenter_driver.rb

@@ -63,8 +63,7 @@ class VCenterConf < Hash
             vcenterrc_path = "#{VAR_LOCATION}/remotes/etc/vmm/vcenter/vcenterrc"
             merge!(YAML.load_file(vcenterrc_path))
         rescue StandardError => e
-            STDERR.puts error_message("Couldn't load vcenterrc. \
-                                       Reason #{e.message}.")
+            STDERR.puts "Couldn't load vcenterrc. Reason #{e.message}."
         end
 
         super