Fix Bug 2086 Updating VNF status configurable

This fix allows to set REFRESH_ACTIVE period as config option which
periodically checks the VM status from VIM. Env variable can be set in the
ro container export OSMRO_PERIOD_REFRESH_ACTIVE=-1 to disable VM status updates.
This config parameter allowed to set >= 60 seconds or -1.
Making the stage-releasenotes.sh executable and fix the syntax errors in stage-build.sh.

Change-Id: I90a859d9b831c1ce24faea4eab12dc998ac655d5
Signed-off-by: aticig <gulsum.atici@canonical.com>
diff --git a/NG-RO/osm_ng_ro/ro_main.py b/NG-RO/osm_ng_ro/ro_main.py
index 2a2e22c..376c087 100644
--- a/NG-RO/osm_ng_ro/ro_main.py
+++ b/NG-RO/osm_ng_ro/ro_main.py
@@ -854,7 +854,7 @@
             elif k1 == "tools":
                 # update [/] configuration
                 engine_config["/"]["tools." + k2.replace("_", ".")] = yaml.safe_load(v)
-            elif k1 in ("message", "database", "storage", "authentication"):
+            elif k1 in ("message", "database", "storage", "authentication", "period"):
                 engine_config[k1][k2] = yaml.safe_load(v)
 
         except Exception as e: