ExcludeFromVendorSnapshot() must return true if the module must not
be snapshotted and built from the vendor source tree.
The default value must be false because rust modules are provided by
the system source tree.
Bug: 184042776
Bug: 189372652
Test: m nothing
Change-Id: I267c3a5674bea966d1dd831cda73538ae94cf25f
Merged-In: I267c3a5674bea966d1dd831cda73538ae94cf25f
(cherry picked from commit 9e13187f6b733f689f9552aa3ca8eb329140f427)
Refactors the vendor snapshot support to use the LinkableInterface
so that support can be extended to Rust. This CL does not add
vendor snapshot support for Rust; that is left for a follow-on CL.
Bug: 184042776
Test: m nothing
Change-Id: Id0c4970ca00053484a52677d182153cbc454c301
Justin Yun