Print either 'user was created' or 'error creating user', but not both.

Otherwise we would get something like this:

  useradd: user 'rdesktop' already exists
  Error creating user rdesktop
  User rdesktop was created

install-labmanager.sh

@@ -56,8 +56,9 @@ myuseradd() {
   useradd -b /local -m ${R_UID} ${R_GID} -r ${R_USER}
   if [ $? -ne 0 ]; then
     echo "Error creating user ${R_USER}"
+  else
+    echo "User ${R_USER} was created"
   fi
-  echo "User ${R_USER} was created"
 }
 
 function removeFiles {