Failed to add user

[JojoWu19]

When we run the account_management.py, we get the result with failed to add user.
After changing code to check message, the root cause is that service doesn't support to modify the property Enabled so tool gets 400 Bad Request with message PropertyNotWritable.

1. Suggest to add the message of response in the result for helping to clarify error.
2. Suggest to modify more properties of ManagerAccount to avoid this case.

Thank you.