Merge pull request #407 from jakllsch/netbsd-group

don't use the non-existant gshadow database on NetBSD either

cdist/conf/type/__group/explorer/gshadow

@@ -24,9 +24,11 @@
 name=$__object_id
 os="$($__explorer/os)"
 
-if [ "$os" = "freebsd" ]; then
-   echo "FreeBSD does not have getent gshadow"
-   exit 0
-fi
+case "$os" in
+    "freebsd"|"netbsd")
+	echo "$os does not have getent gshadow"
+	exit 0
+    ;;
+esac
 
 getent gshadow "$name" || true