Add new integration tests for TokenAPI

[has5aan]

Description

Following modules and their containing commands are dependent on TokenAPI and make good candidates for integration tests.

Modules dependent on TokenAPI

• DPosModule
• RewardModule
• FeeModule

DPoSModule

• DPoSModule.finalizeGenesisState consumes TokenAPI.getLockedAmount

Commands

• ReportDelegateMisbehaviorCommand.execute consumes TokenAPI.getAvailableBalance
• UnlockCommand.execute cosumes TokenAPI.unlock
• VoteCommand.execute consumes TokenAPI.lock

FeeModule

• FeeModule.beforeCommandExecute consumes TokenAPI.transfer and TokenAPI.burn

RewardModule

• RewardModule.afterTransactionsExecute consumes TokenAPI.mint

Which version(s) does this affect? (Environment, OS, etc...)

Lisk SDK development branch.

[has5aan]

The test improvement suggested by the issue for TokenMethod (previously TokenAPI) in components consuming it have been tested and reviewed in the current unit test improvement activity. The relevant action on the suggestion would require implementation of integration tests for the each module dependent on the TokenMethod which doesn't serve practically effective improvements.