MMD-1023 add returnAddress

[festelo]

No description provided.

[ltfschoen]

could we please add appropriate tests in the https://github.com/DataHighway-DHX/deployer/tree/main/tests, similar to those in https://github.com/DataHighway-DHX/mining/tree/master/test, which also include testing that the returnAddress functionality fully works

and then check that the tests fail when we try to use contracts from https://github.com/DataHighway-DHX/mining/tree/master/contracts that don't allow the user to specify a returnAddress, and then modify the code in that other repo so that a user who provides specific return address has all their funds returned to that address, and otherwise the funds are returned by default to the address that originally locked or signalled, and exhaust all the different things they have to do to have the funds returned, or whether it's done automatically.

[festelo]

could we please add appropriate tests in the https://github.com/DataHighway-DHX/deployer/tree/main/tests, similar to those in https://github.com/DataHighway-DHX/mining/tree/master/test

it's a lot easier to test contract only at https://github.com/DataHighway-DHX/mining/tree/main/tests and test only deployer itself in deployer in deployer.