Check if there is not running container for given image

[koudis]

At the startup, I want to check if there is not container running for a given image name.

If the container is running before the init phase of the build the init fails because docker cannot start the second container for the image name and same bind ports.

Basically, each of our build containers shall have port 1122 bind as a SSH Server port. If there is a container that uses port 1122 then we can not start our build container.

As a result we need to check that there are no container that are bound to port 1122

[koudis]

The issue is needs to be resolved after #8

[koudis]

The #8 is no more prerequisite.