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[ISSUE 3825] Use default SO_SNDBUF/SO_RCVBUF/WRITE_BUFFER_WATER_MARK value. (#3826)

This commit may greatly increase thoughtput when network lantency is big or message size is big, especially for consumer.

In one broker (M/S sync master async flush), one producer send test.

250 byte body: 0.93x old version
4000 byte body: 3.85x of old version
16000 byte body: 6.07x of old version
100000 byte body: 7.93x of old version

The old version is 4.9.3-SNAPSHOT in this test. In this test the network latency from producer to broker is 1.61ms.

34 of 34 new or added lines in 5 files covered. (100.0%)

21734 of 42482 relevant lines covered (51.16%)

0.51 hits per line