Various fixes in preparation of Stratum demo at ONS 2019

- Do not read counters with table entries for Barefoot drivers
- If driver behavior setup fails, log which operation we are aborting
- Remove unnecessary setup steps in Stratum-related drivers
- Always get clients by their key in gRPC-based drivers
- Log when P4Runtime group operation fails because of missing group in
store
- Fix polling of table entry counters for P4Runtime driver

Change-Id: Ic9bf19b76d8cb5a191aec24852af4410fea8b998
diff --git a/drivers/gnmi/src/main/java/org/onosproject/drivers/gnmi/OpenConfigGnmiPortStatisticsDiscovery.java b/drivers/gnmi/src/main/java/org/onosproject/drivers/gnmi/OpenConfigGnmiPortStatisticsDiscovery.java
index a41144e..fa7231f 100644
--- a/drivers/gnmi/src/main/java/org/onosproject/drivers/gnmi/OpenConfigGnmiPortStatisticsDiscovery.java
+++ b/drivers/gnmi/src/main/java/org/onosproject/drivers/gnmi/OpenConfigGnmiPortStatisticsDiscovery.java
@@ -50,7 +50,7 @@
 
     @Override
     public Collection<PortStatistics> discoverPortStatistics() {
-        if (!setupBehaviour()) {
+        if (!setupBehaviour("discoverPortStatistics()")) {
             return Collections.emptyList();
         }