change some repo to our github site

Change-Id: I0846ebafe531d7fe4ebfa416499cf8f4bb8ede7d
change some repo to our github site

Change-Id: I58a9c4ad6acd68ecb4383d896fd4cad99d19cadc
Merge "change some repo to our github site" into kitkat
Add git/gerrit related cmd readme

Change-Id: Ic55bdaa330cf36760d385147a258e78a00a213c8
Merge "Add git/gerrit related cmd readme" into kitkat
Merge remote-tracking branch 'magic/kitkat' into kitkat