Added emulator-compatible services and VNFs for R4 integration tests.

The emulator needs slightly modified test NSDs and VNFDs
to work with. This commit adds such examples based on the
official hackfest_1 and hackfest_2 services.

These example descriptors/packages are also used for the R4
integration tests with vim-emu.

Change-Id: Ief26dbdbb15dc973e7563923394d7e7e90579fab
Signed-off-by: peusterm <manuel.peuster@uni-paderborn.de>