Package the defaults file.

Loading new feature flag defaults from a file enables deployment of new
features by deploying a new defaults file rather than deploying the
entire software package.

One mechanism that we can effect this deployment is by using regular
Debian packaging; here, we introduce a new package `cuttlefish-defaults`
for rolling out feature flag default changes. When we want to
experimentally deploy a new feature associated with a feature flag, the
defaults file is changed and a new release of this package is cut. This
new version of the package can reside in an unstable repository at a
different cadence from the software package, which can go to stable
earlier.

Author: 3405691582

base/debian/cf_defaults

@@ -98,3 +98,9 @@ Provides: ${diverted-files}
 Description: Utilities for Android cuttlefish devices in the cloud
  Configuration and utilities for Android cuttlefish devices running on
  Google Compute Engine. Not intended for use on developer machines.
+
+Package: cuttlefish-defaults
+Architecture: any
+Depends: cuttlefish-base,
+Description: May potentially enable new or experimental cuttlefish
+ features before being enabled by default.

base/debian/control

@@ -0,0 +1 @@
+debian/cf_defaults /usr/lib/cuttlefish-common/etc/