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: I427d8649da7781356070a11679ade9705fe096bf
Merged-In: I427d8649da7781356070a11679ade9705fe096bf
1 file changed