sockets: add ability to disable DNS resolution for InetSocketAddress
Add a 'numeric' flag to the InetSocketAddress struct to allow the caller to indicate that DNS should be skipped for the host/port fields. This is useful if the caller knows the address is already numeric and wants to guarantee no (potentially blocking) DNS lookups are attempted. Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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