Make virsh reconnect when losing connection
When the daemon libvirtd restarts, a connected virsh gets a SIGPIPE and dies. This change the behaviour to try to reconnect if the signal was received or command error indicated a connection or RPC failure. Note that the failing command is not restarted. * tools/virsh.c: catch SIGPIPE signals as well as connection related failures, add some automatic reconnection code and appropriate error messages.
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