virsh: Improve checking for connection when running commands
Almost each virsh command uses the function vshConnectionUsability before doing anything, to check if the connection is "alive". Commands that don't need an conection are already conveniently marked with VSH_CMD_FLAG_NOCONNECT. We can automaticaly check for the connection before calling any remote command so we don't forget to do so. This patch also upgrades the connection check to use virConnectIsAlive along with the current approach.
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