support custom images

For the moment, only images ceclared in config are allowed. This is related to the fact that swarm does not allow (yet) a pull on nodes. Container image must be available on all nodes.

Swarm next release should implemented this (../images/create?fromImage=busybox) and only to pull an image on all nodes.

=> add option for fixed images only or allow user images => if allow user images, add an api/web page to request new image. Background task will ask executor to pull the image on nodes, then, when available add image to a list of images. => put list of availble images in database

Pull is not executed at container start because pull may be done on all nodes (according to executor). This should be done in background regular task (an other daemon?)

In the meanwhile, admin should pull images on all nodes then add image to config.

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