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/p4runtime/src/main/java/org/onosproject/drivers/p4runtime/P4RuntimePacketProgrammable.java b/drivers/p4runtime/src/main/java/org/onosproject/drivers/p4runtime/P4RuntimePacketProgrammable.java
index 73acf98..9010c51 100644
--- a/drivers/p4runtime/src/main/java/org/onosproject/drivers/p4runtime/P4RuntimePacketProgrammable.java
+++ b/drivers/p4runtime/src/main/java/org/onosproject/drivers/p4runtime/P4RuntimePacketProgrammable.java
@@ -33,7 +33,7 @@
     @Override
     public void emit(OutboundPacket packet) {
 
-        if (!this.setupBehaviour()) {
+        if (!this.setupBehaviour("emit()")) {
             return;
         }