Remove app.temp.dir configurability, because it is confusing. User may think that they can provide an absolute path and then that temp dir will be used, but its always used as a relative path.
We should not allow it to be configurable, or at least put in the description that it is always used as a relative path.
Relevant spot in documentation: https://github.com/caskdata/cdap/blob/v4.2.0/cdap-docs/admin-manual/source/_includes/installation/configuration.txt#L224-L224
Also, it is misleading to allow users to configure both 'local.data.dir' AND LOCAL_DIR. It should be sufficient to just configure LOCAL_DIR, and leave 'local.data.dir' be as simple as the default value 'data'. If there's no use case for configuring these separately, we should remove one from documentation, for simplicity.