Update gnbsim, sctplb images

- Also correcting metricfunction name in the helm charts
- Updating mongoDB helm charts

Change-Id: I9627cd6e819f1c91ad7b8d571c448cb23ab912ee
diff --git a/5g-ran-sim/Chart.yaml b/5g-ran-sim/Chart.yaml
index ea24c33..0719590 100644
--- a/5g-ran-sim/Chart.yaml
+++ b/5g-ran-sim/Chart.yaml
@@ -8,4 +8,4 @@
 name: 5g-ran-sim
 icon: https://guide.opencord.org/logos/cord.svg
 
-version: 0.5.1
+version: 0.5.2