* add 'update_password' param to manageiq_user
Currently with the manageiq_user module, if you call it repeatedly while passing the 'password' parameter, it will always run the task and mark it as 'changed'.
Following the pattern of the AWS IAM module, add an 'update_password' parameter that takes 'always' (default) or 'on_create'. This will let you set an initial password when creating a user, but allow the user to modify their password and not stomp over their password changes if you re-run the playbook/task that created the user.
* don't stomp password when other fields change
Handle case where user fields change, but we don't want to stomp on a potentially user-changed password. Previously, if a non-password field changed, and the password param was passed in, it would ignore the 'update_password': 'on_create' setting (ie it would update/modify the password even if the user already exists).
Add trailing ',' to list of params.
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