THRIFT-4612: THeader support in go library

Client: go

Implement THeaderTransport and THeaderProtocol, with support of:

* clients:
  - headers
  - framedBinary
  - unframedBinary
  - framedCompact
  - unframedCompact
* transforms:
  - none
  - zlib
* info types:
  - key_value
* wrapped protocols:
  - TBinary
  - TCompact

The support list is in general on par of the THeader implementation in
the python library.

The cross-test passes, except ones related to cpp/nodejs http transport,
which were also failing for non-theader protocols.

This change also fixes two bugs:

1. A small issue in test/go/src/bin/testserver/main.go
2. A bug in TFrameTransport go implementation
diff --git a/lib/go/thrift/header_protocol_test.go b/lib/go/thrift/header_protocol_test.go
new file mode 100644
index 0000000..9b6019b
--- /dev/null
+++ b/lib/go/thrift/header_protocol_test.go
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package thrift
+
+import (
+	"testing"
+)
+
+func TestReadWriteHeaderProtocol(t *testing.T) {
+	ReadWriteProtocolTest(t, NewTHeaderProtocolFactory())
+}