* Revert "Revert "Move mockito to 3.0.0-alpha. (#15949)" (#15979)"
This reverts commit e59651f925.
* More thenReturn to thenAnswer when mocking Futures
* Revert "More thenReturn to thenAnswer when mocking Futures"
This reverts commit 194d2cf417 as we are reverting engine roll.
* Revert "Revert "More thenReturn to thenAnswer when mocking Futures""
This reverts commit 52c9e96b30.
* Add dependency override
* Fix issue
* Move mockito to 3.0.0-alpha.
This is needed so it matches mockito version used internally.
* Pick up +2 for the fixes
* Fix whenReturn in fuchsia_remote_debug_protocol
* more thenReturn becomes thenAnswer
* more thenReturn becomes thenAnswer
* more thenReturn becomes thenAnswer
* Remove the workaround that pinned args to v0.13.6
This reverts most of the changes in commit 6331b6c8b5
* throw exception if exit code is not an integer
* rework command infrastructure to throw ToolExit when non-zero exitCode
* convert commands to return Future<Null>
* cleanup remaining commands to use throwToolExit for non-zero exit code
* remove isUnusual exception message
* add type annotations for updated args package
