Reenable cooperativeSettle

[loredanacirstea]

We commented out cooperativeSettle in #270

These should be changed back when re-enabling cooperative settle:

Contracts

• uncomment cooperativeSettle

  raiden-contracts/raiden_contracts/contracts/TokenNetwork.sol

  Line 814 in d47aa6b

  /* /// @notice Cooperatively settles the balances between the two channel

• uncomment recoverAddressFromCooperativeSettleSignature

  raiden-contracts/raiden_contracts/contracts/TokenNetwork.sol

  Line 1441 in d47aa6b

  /* function recoverAddressFromCooperativeSettleSignature(

Test contracts

• uncomment recoverAddressFromCooperativeSettleSignaturePublic recoverAddressFromCooperativeSettleSignaturePublic

Tests

• unskip all cooperative settle tests in https://github.com/raiden-network/raiden-contracts/blob/d47aa6b6adbbfc3702e2258387d7695c96101d7b/raiden_contracts/tests/test_channel_cooperative_settle.py
• unskip test_recover_address_from_cooperative_settle_signature

  raiden-contracts/raiden_contracts/tests/unit/test_unit_signatures.py

  Lines 173 to 174 in d47aa6b

  	@pytest.mark.skip(reason='Delayed to another milestone')
  	def test_recover_address_from_cooperative_settle_signature(

[hackaugusto]

Note, withdraw was re-enabled by #711 . coop seetle is redundant with withdraw, since we can implement it with two withdraws done by a proxy smart contract. This is not really necessary anymore.