Android tv-casting-app: Fetch DAC dynamically

[sharadb-amazon]

Problem

The android tv-casting-app uses a Test DAC that is hardcoded into the app.

Proposed Solution

Add an ability to fetch the DAC from a remote server to initialize the app

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[stale]

This stale issue has been automatically closed. Thank you for your contributions.