Fix cloud-init insertion with v3 IM

Change-Id: Ia7657f255ff0f10d2bd1cfa934e2d15b89ef187b
Signed-off-by: gcalvino <guillermo.calvinosanchez@altran.com>
diff --git a/osm_ro/nfvo.py b/osm_ro/nfvo.py
index fcc7899..6ce8cd0 100644
--- a/osm_ro/nfvo.py
+++ b/osm_ro/nfvo.py
@@ -976,7 +976,7 @@
                                                     "content": cfg_source})
                         boot_data['config-files'] = om_cfgfile_list
                 if boot_data:
-                    db_vm["boot_data"] = boot_data
+                    db_vm["boot_data"] = yaml.safe_dump(boot_data, default_flow_style=True, width=256)
 
                 db_vms.append(db_vm)
                 db_vms_index += 1