Branch cut for Kylin 2.5

[ShaoFeng Shi]

Hi Kylin developers,

As most features of Kylin 2.5 have been done, and now there are some PRs
won't go to 2.5, the "2.5.x" branch. If you have change need to be included
in 2.5, please double commit/pr.

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Best regards,

Shaofeng Shi 史少锋