init git for xen

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+The master branch has no content
+
+Look at the c7 branch if you are working with CentOS-7, or the c4/c5/c6 branch
+for CentOS-4, 5 or 6. If you find this file in a distro specific branch, it 
+means that no content has been checked in yet
+
+More information on how these git repositories are setup, is available at 
+http://wiki.centos.org/Sources