Fixes bug #1364939

* lxc.go - if a container fails to start, i added a few lines that try to delete the
  potentialy-created container (creation of the container might have failed at an
  earlier stage).
* eviron.go - if container creation fails for some reason (e.g. there was a corrupt
  lefover container from on of previous deploys that fails to start), the local provider
  will retry container creation once more