[VOL-3069]Pass Context down the execution call hierarchy across voltha codebase

Change-Id: I16560357c5fc130f834929e7e2e92cee14b518e2
diff --git a/pkg/db/kvstore/client.go b/pkg/db/kvstore/client.go
index 158e626..480d476 100644
--- a/pkg/db/kvstore/client.go
+++ b/pkg/db/kvstore/client.go
@@ -88,6 +88,6 @@
 	AcquireLock(ctx context.Context, lockName string, timeout time.Duration) error
 	ReleaseLock(lockName string) error
 	IsConnectionUp(ctx context.Context) bool // timeout in second
-	CloseWatch(key string, ch chan *Event)
-	Close()
+	CloseWatch(ctx context.Context, key string, ch chan *Event)
+	Close(ctx context.Context)
 }