Fix trailing whitespace in Dockerfile
Fix trailing whitespace in Dockerfile

bpradipt/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb