rPuppy: Update Makefile and Dockerfile

Change-Id: I3832c88878b517554ceecaa89fe8a0a03ee1876f
diff --git a/charts/rpuppy/templates/install.yaml b/charts/rpuppy/templates/install.yaml
index 5cde9c9..1d70bd5 100644
--- a/charts/rpuppy/templates/install.yaml
+++ b/charts/rpuppy/templates/install.yaml
@@ -37,7 +37,7 @@
           containerPort: 8080
           protocol: TCP
         command:
-        - rpuppy
+        - /usr/bin/rpuppy
         - --port=8080
         resources:
           requests: