storage: open nodedev driver connection at time of use
Instead of passing around a virConnectPtr object, just open a connection
to the nodedev driver at time of use. Opening connections on demand will
be beneficial when the nodedev driver is in a separate daemon. It also
solves the problem that a number of callers just pass in a NULL
connection today which prevents nodedev lookup working at all.
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>
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