Docker: Update 0.5.4 (no API changes)

Signed-off-by: Chris Evich <cevich@redhat.com>
dockertest.dockercmd: Add AsyncDockerCmd property executed

This property is useful during cleanup, when we need to find out
whether this command was executed and we should clean after it.

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
subtests.docker_cli: Add the `docker wait` test

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
dockertest.dockercmd: Track execution status

*  Adds ``executed`` attribute
*  Adds ``execute_calls()`` method
*  Adds new DockerRuntimeError exception
*  Updated unittests

Signed-off-by: Chris Evich <cevich@redhat.com>
subtests...run_volumes: Add remote volume test

Signed-off-by: Chris Evich <cevich@redhat.com>
Merge pull request #52 from cevich/docker_0.5.4

Docker: Minor update 0.5.4 (no API changes)