Quote role name in postgres_user alter role

If you had a user www-data then this state would fail. The create works fine, 

Something like the below should illustrate this. I first found it by creating a user without a password and then setting a password on a subsequent run

```yaml
# Create the user, this will work
postgresql_user_create:
  postgres_user.present:
    - name: www-data
    - password: old_password

# Change the password, this will fail
postgresql_user_change_password:
  postgres_user.present:
    - name: www-data
    - password: new_password
    - require:
      - postgres_user: postgresql_user_create

```