New git repo setup and available to use

[Hitesh Shah]

Hi folks, 

The new repo should be up and running. incubator-tez.git should no longer be 
accessible.

  - https://git-wip-us.apache.org/repos/asf?p=tez.git
  - https://svn.apache.org/repos/asf/tez/site

thanks
— Hitesh