I added libxml2-dev (needed for celix discovery) and screen (to have several terminal within one docker container)  for the apt-get part. Besides, I updated the celix revision to the current state which also includes CELIX-152 (discovery w/ etcd) and CELIX-153 (capability to disable SLP and bonjour for building)
Merge pull request #1 from bpetri/master

Updated Dockerfile