Merge Request for #4808: TYPO in C++ client producer method for processing failure case, and add corresponding unit test case. (#4873)

Definitely, this is a typo. This method is dealing with the Failed Message with the GIVEN result, but not a CERTAIN result.

Contribution Checklist
#4808 : TYPO in C++ client producer method for processing failure case
Add c++ client producer failure message unit test case.

UT passed:

BatchMessageTest
(cherry picked from commit b90b4ea1)

C++ client producer sendAsync() method will be blocked forever, if enough batched messages sent timeout. (#4569) (#4657)

(cherry picked from commit 2f686157)

* support max message size for cpp and go client
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* format cpp code
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix maxMessageSize logic
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix comments
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix comments
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix comments
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix comments
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix ci error
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix comments
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix comments
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

* fix comments
Signed-off-by: Nxiaolong.ran <ranxiaolong716@gmail.com>

The sendTimer_ may not be initialized if connection doesn't come up
correctly.

* In C++ allow messages that compress to <5mb to be sent with batching enabled

* Fixed related test

* Replaced boost::bind with std::bind

* Fixed merging with master

* std::bind doesn't work with overloaded functions

* Go back to asio thread to executor service

* Use proper ref-count increase for WaitForCallback utility

### Motivation

Want to remove boost dependencies from CPP Client interface.

### Modifications

Changed boost smart pointers and functions to std.

### Result

No change in the code logic.

* Pass schema info to C++ client

* Comments

### Motivation
While debugging we realized that there were log messages in the cpp client which were not of much use since topic names weren't mentioned and closing a Client/Consumer/Producer message was under DEBUG instead of INFO.

### Modifications
Added topic names to the relevant messages and changed log level to info for closing a Client/Consumer/Producer message.

### Result
Logs make a little more sense.

### Motivation

We already have flush() method in java api: http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/Producer.html#flush--
It is better to provide a same method for cpp client.

### Modifications

Add related methods in cpp client.
Add related tests.

### Result

Cpp unit tests pass.

* [client] add properties to producer for cpp & python client

 ### Motivation

This is a caught-up change to enable properties for producer as java clients.

 ### Changes

Enable properties on producer for both cpp & python client

 ### Results

Properties are added as metadata for CommandProducer. However there is no way
to verify the producer properties. so I didn't add any specific tests, just
adding properties for both cpp and python clients in the tests, that should
excerise the corresponding code path.

* Add `properties` to pydoc

* Change clang-format options

* Exclude the files generated by protobuf from `make format`

* ENH: Apply `make format` into C++ client

* Change clang-format version to 5.0

* Use gpg2 when docker build
See https://github.com/rvm/rvm/issues/3544

* Apply clang-format-5.0

* Use `make check-format` on docker-build.sh

* Fix typo

* Reader API for C++ clienReader API for C++ clientt

* Fixed compile error with listener function

* Fixed compile errors and PR comments

* Fixed conversion between MessageId and BatchMessageId

* Removed usage of std::tie

* Revert change in BatchMessageId since it breaks the tracker

* Increase available permits only once

* Message size validation on post compression

* check blockQueue after payload size

* Change topic-name to avoid conflict in parallel test-runs

* Updates headers with ASF source files header

* change license to additional files