release-v1.6.24-20191220

2019-12-20 Alibaba Cloud.

* VERSION: 1.6.24
* BUGFIX: cluster receive channel size adjust from 4096 to `sender.count`.
* BUGFIX: update redis-go-cluster to solve the send and receive
concurrency conflict.
* BUGFIX: fix some bugs in redis-go-cluster including io timeout problem,
see #192, #210.
* IMPROVE: set 'psync' to true by default in configuration, if the source
redis version is less than v2.8, switch to false.
* IMPROVE: when target version is less than the source, do restore
directly. Then catch the "Bad data format" and retry by split value. see
#211.
* IMPROVE: catch more errors in `restoreBigRdbEntry` function.
* BUGFIX: merge bad resp CRLF bugfix, see #204.