Fix Bug 994: Add fs.sync before deploying charm

Change-Id: I673e714e375bef5b5a697e53b9f64c9dcd793d55
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/osm_lcm/ns.py b/osm_lcm/ns.py
index 07e3125..7a64f5d 100644
--- a/osm_lcm/ns.py
+++ b/osm_lcm/ns.py
@@ -1083,6 +1083,7 @@
                     element_under_configuration = "{}-{}".format(vdu_id, vdu_index or 0)
 
             # Get artifact path
+            self.fs.sync()  # Sync from FSMongo
             artifact_path = "{}/{}/charms/{}".format(
                 base_folder["folder"],
                 base_folder["pkg-dir"],