Merge changes from topic "weaver-vts-fix" into stage-aosp-udc-ts-dev

* changes:
  Allow uninstantiated WeaverTest
  Don't overwrite in-use Weaver slots during VTS
  Simplify Weaver VTS test
  Remove redundant HIDL Weaver VTS test
  Move VtsHalWeaverTargetTest to common directory
  Make VtsHalWeaverTargetTest test both HIDL and AIDL services
  Update OWNERS for Weaver