More verbose errors failure messages

[francisdb]

Not sure if this would be possible but sometimes a bunch of our tests fail with Cannot run all required containers. This is not very helpful.

Something more verbose would be better, like could not start container for mongodb:123 because the condition XYZ was not reached, and also logging the startup logs?

sbt.ForkMain$ForkError: java.lang.RuntimeException: Cannot run all required containers
	at com.whisk.docker.DockerKit.startAllOrFail(DockerKit.scala:59)
	at com.whisk.docker.DockerKit.startAllOrFail$(DockerKit.scala:43)