Change vts-core package to generic *ts package rule

The current package logic is based on general-tests and device-tests,
which have special rules to package test artifacts in a diffrent way.
vts-core suite should follow the generic *ts package rule.

Bug: 149249068
Test: m -j vts-core && vts-core-tradefed
run some vts-core test

Change-Id: Ib6ab7eb0fb4b8c898a0b3617d10be04dc98c2daa