Merge pull request #1080 from menghanl/travis_go18

add go1.8 to travis.yml

.travis.yml

@@ -4,6 +4,7 @@ go:
   - 1.5.4
   - 1.6.3
   - 1.7
+  - 1.8
 
 go_import_path: google.golang.org/grpc
 

test/end2end_test.go

@@ -496,7 +496,7 @@ func (te *test) startServer(ts testpb.TestServiceServer) {
 	la := "localhost:0"
 	switch te.e.network {
 	case "unix":
-		la = "/tmp/testsock" + fmt.Sprintf("%d", time.Now())
+		la = "/tmp/testsock" + fmt.Sprintf("%d", time.Now().UnixNano())
 		syscall.Unlink(la)
 	}
 	lis, err := net.Listen(te.e.network, la)