tests: fix gathering of test src files
tests: fix gathering of test src files

- Use hard links instead of soft links so
  that python module import works correctly
  for relocated test/vpp_*.py modules.

Type: fix

Signed-off-by: Dave Wallace <0ed937c0e4b2f09f7bc24acf16cee52b8a199d5f@gmail.com>
Change-Id: If9c031bf0918344dedd4dee5f9336e869590b0ae

FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp