CLI tools connect to wrong address from configuration

The various command line tools of Gitaly and Praefect generally connect to the server and do their tasks by calling some RPCs. They read address from the configuration file. The listen_addr in configuration is not necessarily the address the server is serving at since it's a common scenario to bind to all addresses with using 0.0.0.0 as the listen address. This leads to the command line tools attempting to connect to 0.0.0.0 and fail.