Bug 1651 fix

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: I5a25c97b48692c23b5520cf72becb7b5bbcf327a
Signed-off-by: gatici <gulsumatici@gmail.com>