Configure fabricKitRelease to be enabled only when kits are released.
Configure fabricKitRelease to be enabled only when kits are released.

- This will allow kits_for_release file to manage this task.
- When we decouple repos, this setting can be removed.

Change-Id: I7df6cdfb09916465250b54aa4b2fd20f5c8f8a17

jaydeep17/digits-android,jnbt/digits-android,rameshvoltella/digits-android,dejavu1988/digits-android,dejavu1988/digits-android,metao1/digits-android,twitter/digits-android,twitter/digits-android,rameshvoltella/digits-android,jaydeep17/digits-android,metao1/digits-android