add(chain): Adds a `network_name` field to `testnet::Parameters` #890

Job	Run time
Build CI Docker / Build images	0s
Test with fake activation heights	0s
Test all	0s
Test checkpoint sync from empty state	0s
Test CI default Docker config file / Test default-conf in Docker	0s
Test integration with lightwalletd	0s
Test CI custom Docker config file / Test custom-conf in Docker	0s
	0s

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