Show number of connections rather than number of entries in socketmap at client-side & show number of pooled connections after protocol names

fix the bug in SocketMapList that input is not cleared when socketmap is not created & add a multi-threaded client for thrift

remove extra semicolon

tools/CMakeLists.txt supports glog

1. Add ThriftStub to send and receive native thrift messages & specify method-name directly. As a result, ThriftMessage<T> is removed.
2. ThriftFramedMessage (no matter Cast<>-ed or not) can be sent/received as well so that building proxies of thrift is much easier.
3. ThriftFramedMessage::Cast<T> can be called multiple times with reasonable behaviors, even if T is changed.
4. Server-side errors are sent to client as TApplicationException instead of closing the connection.
5. Code in ThriftService::ProcessThriftFramedRequest() can throw exceptions which will be sent to client as errors as well.
6. Simplify ThriftClosure which does not need many stuffs inherited from NsheadClosure.
7. Port protocol-related patches to thrift_protocol.cpp which was changed before the patches.
8. Remove the unnecessary default malloc when constructing TMemoryBuffer.
9. Use TBinaryProtocolT instead of TBinaryProtocol to make read/write non-virtual, and remove the unnecessary shared_ptr on iprot/oprot.
10. request/response must be ThriftFramedRequest when protocol is thrift, which was not checked before.
11. Limit max length of thrift_method_name (to a reasonable large value) so that intermediate buffer can be allocated on stack directly.
12. Make ThriftFramedMessage uncopyable since the TBase* inside does not have a general copy function.

Add thrift performance test report in doc

Fix thrift method name issue

support for SO_REUSEPORT socket option

- find libthrift* in example when using brpc with thrift protocol
  enabled