stringify prefix for networks and not only its subnets #1328

Job	Run time
unit_specs-director (postgresql)	3m 47s
unit_specs-director (mysql)	5m 55s
unit_specs (common:parallel)	55s
unit_specs (nats_sync:parallel)	1m 2s
unit_specs (release)	56s
unit_specs (monitor:parallel)	1m 1s
	13m 36s

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