AMF & MME image updates

AMF :
  1) fix amf crash when old gnb sends messages
  2) fix related to typecasting of messages to wrong message type
  3) fix for updating logging handles
  4) misc fixes

MME :
  fix for memory leak

SGW: Removing DNS config from helm chart
  enable Gx interface by default
  enable UPF failure detection based on heart beat failure
Change-Id: Ia50ca975c912c1f09561076f5bd95c40c7fad4f9
diff --git a/5g-control-plane/Chart.yaml b/5g-control-plane/Chart.yaml
index 7f33d63..cd82e69 100644
--- a/5g-control-plane/Chart.yaml
+++ b/5g-control-plane/Chart.yaml
@@ -8,7 +8,7 @@
 name: 5g-control-plane
 icon: https://guide.opencord.org/logos/cord.svg
 
-version: 0.5.0
+version: 0.5.1
 
 dependencies:
   - name: mongodb