Rename vts-core to vts

Bug: 151896491
Test: local build
Exempt-From-Owner-Approval: This CL moves all tests in vts-core to vts.
It won't change test logic or behavior.

Change-Id: I79cddf5e4a65486b8f1286ea430360479ad2b93d
Merged-In: I79cddf5e4a65486b8f1286ea430360479ad2b93d
2 files changed