Using latest rw-core

Change-Id: Ib711dff6594ae758c16cab3e85279fcf7d75a0d4
diff --git a/voltha/values.yaml b/voltha/values.yaml
index 82ad208..433a67e 100644
--- a/voltha/values.yaml
+++ b/voltha/values.yaml
@@ -97,5 +97,5 @@
   rw_core:
     registry: '{{ .Values.global.image_registry }}'
     repository: '{{ .Values.global.image_org }}voltha-rw-core'
-    tag: '{{- if hasKey .Values.global "image_tag" }}{{- if .Values.global.image_tag }}{{ .Values.global.image_tag }}{{- else }}2.6.3{{- end }}{{- else }}2.6.3{{- end }}'
+    tag: '{{- if hasKey .Values.global "image_tag" }}{{- if .Values.global.image_tag }}{{ .Values.global.image_tag }}{{- else }}2.7.0{{- end }}{{- else }}2.7.0{{- end }}'
     pullPolicy: '{{ .Values.global.image_pullPolicy }}'