improvements in dbmemory. Change yaml.load to save_load

Change-Id: I577efa64a8c1503a084cb21b49ec7e3665b7b56f
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/osm_common/msglocal.py b/osm_common/msglocal.py
index 965cb26..843b376 100644
--- a/osm_common/msglocal.py
+++ b/osm_common/msglocal.py
@@ -112,7 +112,7 @@
                         self.buffer[single_topic] += self.files_read[single_topic].readline()
                         if not self.buffer[single_topic].endswith("\n"):
                             continue
-                        msg_dict = yaml.load(self.buffer[single_topic])
+                        msg_dict = yaml.safe_load(self.buffer[single_topic])
                         self.buffer[single_topic] = ""
                         assert len(msg_dict) == 1
                         for k, v in msg_dict.items():