Using same hook for nested calls instead of splitted ones

[marcelomorgado]

The Decentraland.test.js test suite has splitted beforeEach hooks for nested call (to avoid callback hell). Isntead of that, we should write those on the same hook using style proposed by @pcowgill:

// buildManaAction here
// buildEthAction here
// buildMarketplaceAction here

functionThatSetsManaDone {
  if (marketplaceDone) {
    functionThatHandlesMarketplaceAndManaDone()
  }
}

functionThatShipsManaAndMarketplaceApproval {
  manaAction.send()
  marketplaceAction.send()
}

ethAction.on('confirmation', functionThatShipsManaAndMarketplaceApproval)
manaAction.on('confirmation', functionThatSetsManaDone)
marketplaceAction.on('confirmation', functionThatSetsMarketplaceDone)

ethAction.send()

Refs: #369 (comment)