Bug 1651 fix

Code revision is done after review.

This fix is required to fix VCA metric collection for SOL006 compatible descriptors.

Related bug: https://osm.etsi.org/bugzilla/show_bug.cgi?id=1651



Change-Id: I4de6e9ae368ba77a2e1e591eb220ea98ec7c9788
Signed-off-by: atici <gulsum.atici@ulakhaberlesme.com.tr>