Affinity and antiaffinity implementation.

	- RO descriptor now support "availability_zone" tag in the VNFC descriptor.
	- RO database extend table vms table to include availability_zone.
	- In case a VNF requires more  zones than available in the datacenter, an error message of instantiation failure will be issued and the usual rollback procedure will  start.
	- In case a VDU does not include availability tag, it will be treated as normal, following the default scheduling policy in the VIM.

Change-Id: I335a0db6fa232953f655a598351dd7e7bbb97785
Signed-off-by: mirabal <leonardo.mirabal@altran.com>
diff --git a/openmanod b/openmanod
index 6190a1e..8d17f38 100755
--- a/openmanod
+++ b/openmanod
@@ -48,13 +48,14 @@
 
 __author__ = "Alfonso Tierno, Gerardo Garcia, Pablo Montes"
 __date__ = "$26-aug-2014 11:09:29$"
-__version__ = "0.5.19-r528"
+__version__ = "0.5.20-r529"
 version_date = "Aug 2017"
-database_version = 22      # expected database schema version
+database_version = 23      # expected database schema version
 
 global global_config
 global logger
 
+
 class LoadConfigurationException(Exception):
     pass