Remove invokeAsync() from controller and bus

[diego-G]

Expected behavior

All the communications in the bus are asynchronous.

Actual behavior

Chain module contains synchronous code that produces a too big cascade refactoring if we convert them to async. We have introduced and invokAsync method in controller and bus to work it out until we refactor the codebase introducing the new P2P library. Therefore these temporary methods have to be removed when network module manages all the P2P related actions.

For referene, here it is the commit with the affected code: ef925e6

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

2.0

[diego-G]

Close by 5dbcda8 which is the right direction.