DockerKit's implicit ExecutionContext conflicts with Scalatest's AsyncTestSuite

[prascuna]

Hi there,
when using DockerKit along with ScalaTest's async test suites there's a conflict between the implicit ExecutionContext defined both in AsyncTestSuite and DockerKit traits:

Error:(27, 55) ambiguous implicit values:
 both method executionContext in trait AsyncTestSuite of type => scala.concurrent.ExecutionContext
 and lazy value dockerExecutionContext in trait DockerKit of type => scala.concurrent.ExecutionContext
 match expected type scala.concurrent.ExecutionContext
...

I was wondering if DockerKit could avoid declaring that dockerExecutionContext: ExecutionContext as implicit in order to avoid such conflict.

Thanks
PS: I'm happy to submit a PR if you reckon that might be useful as I do

[prascuna]

Here there is a way to reproduce it:

class TestSpec extends AsyncWordSpec with Matchers with DockerTestKit with DockerMySQLService {
  "A test" should {
    "succeed" in {
      Future.successful(true).map(res => res shouldBe true)
    }
  }
}

DockerMySQLService is a trait that extends DockerKit with DockerKitDockerJava

[juanjoDiaz]

This duplicates #56 which also proposes a workaround and a possible solution

[viktortnk]

Closing it as duplicate of #56