Build:add changelog tool and merge into envsetup.sh

Change-Id: I9537dbc4ab06b7da96c6c6a7bf5e2c6e45f3d68c
Build-Script:update command function and usage

Change-Id: I5b771f1bc8a4f8b65e7f1d929a2a34021949dea0
Build: MoKee Server auto build

Change-Id: I4e724d79cb0974c5ae8099859b76bf631d5b2c9e
Merge "Build: MoKee Server auto build" into jb-mr1_mkt