Merge "Use symlinks instead of unzipping vendor snapshot zip files." am: 0e7bb0182d am: 3688fc6a4c am: 265639822f am: b405b2a15a

Original change: https://android-review.googlesource.com/c/platform/development/+/1437291

Change-Id: Id6eb9bbad14e625f04959d298f648dce0cc75571