Minor bug fixed in VCA build script

Change-Id: I53a3aa7f11f5c6535164678ebf2f26bfd33d0489
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

jenkins/VCA/start_build

@@ -16,6 +16,10 @@
 # 20 Sep 2016 -- Gerardo Garcia -- adapted from template
 # 
 
+HERE=$(realpath $(dirname $0))
+OSM_JENKINS=$(dirname $HERE)
+. $OSM_JENKINS/common/all_funcs
+
 INFO "installing packages"
 apt update
 lxd init --auto