THRIFT-4448: Golang: do something with context.Context. Remove Go1.6 compatibility.
Client: go

This closes #1459
diff --git a/test/go/src/bin/testclient/main.go b/test/go/src/bin/testclient/main.go
index ab24cbf..20104f9 100644
--- a/test/go/src/bin/testclient/main.go
+++ b/test/go/src/bin/testclient/main.go
@@ -21,6 +21,7 @@
 
 import (
 	"common"
+	"context"
 	"flag"
 	"gen/thrifttest"
 	t "log"
@@ -60,6 +61,7 @@
 }
 
 var xcept = &thrifttest.Xception{ErrorCode: 1001, Message: "Xception"}
+var defaultCtx = context.Background()
 
 func callEverything(client *thrifttest.ThriftTestClient) {
 	var err error