Use 3.1.7 tag of voltha-openolt-adapter

Change-Id: I8d6748695b7d1373041a07117c9884168b7affba
diff --git a/voltha-adapter-openolt/Chart.yaml b/voltha-adapter-openolt/Chart.yaml
index 0080999..e349e97 100644
--- a/voltha-adapter-openolt/Chart.yaml
+++ b/voltha-adapter-openolt/Chart.yaml
@@ -14,7 +14,7 @@
 ---
 apiVersion: "v1"
 name: "voltha-adapter-openolt"
-version: "2.8.6"
+version: "2.8.7"
 description: "A Helm chart for Voltha OpenOLT Adapter"
 keywords:
   - "onf"
@@ -33,4 +33,4 @@
 
 # appVersion refers to multiple components with potentially different
 # container image versions.
-appVersion: "3.1.6"
+appVersion: "3.1.7"