Docker tasks print TaskInfo twice

[kitgrose]

Steps to reproduce

Add the following task to your RoboFile and run it (where container_id is the name of a valid Linux Docker container).

public function test() {
    $this->taskDockerExec('container_id')->exec('ls')->run();
}

Expected behavior

The output should contain the following text once before the output of ls:

 [Docker\Exec] Running docker exec  container_id ls

Actual behavior

The output contains that line twice:

 [Docker\Exec] Running docker exec  container_id ls
 [Docker\Exec] Running docker exec  container_id ls

This is apparently caused by line 23 of src/Task/Docker/Base.php, which prints the task info. The task info is already being printed as part of ExecTrait as part of printAction() (called by execute()).

As far as I can tell it seems like the best solution is simply to remove line 23 of src/Task/Docker/Base.php and rely on ExecTrait to print the task info (but I'm not yet familiar enough with the Robo codebase to be confident about that).

System Configuration

macOS Sierra v10.12.4. PHP 5.6.8.

[greg-1-anderson]

Sounds right to me. If the suggested fix clears up the problem for you, a PR would be welcome.