Swap git daemon in xinetd for service

Add git-daemon init file to /etc/init.d and make sure the service
is started.

For transition, keep the git xinetd file and service defined but
switch git service to stopped, we can remove this later.

Change-Id: I0cf02c7292496e39695b80b00cdcb82ec7a61700
Merge "Swap git daemon in xinetd for service"