dockerfile: upgrade to `sameersbn/ubuntu:14.04.20151117`
dockerfile: upgrade to `sameersbn/ubuntu:14.04.20151117`

jrjang/docker-gitlab,crobays/docker-gitlab,creativ/docker-gitlab-ee,creativ/docker-gitlab-ee,vla/docker-gitlab,vla/docker-gitlab,evenh/docker-gitlab,nicolasgnr/docker-gitlab,goodrain-apps/docker-gitlab,solidnerd/docker-gitlab,deruhu/docker_gitlab,ldgeo/docker-gitlab,BirgerK/docker-gitlab,JrCs/docker-gitlab,ldgeo/docker-gitlab,goodrain-apps/docker-gitlab,3kami3/docker-gitlab,deruhu/docker_gitlab,3kami3/docker-gitlab,patope/docker-gitlab,solidnerd/docker-gitlab,JrCs/docker-gitlab,M0E-lnx/gitlab-32bit,iamchanghyunpark/docker-gitlab,revayd/docker-gitlab,sameersbn/docker-gitlab,sameersbn/docker-gitlab,maikelvl/docker-gitlab,BirgerK/docker-gitlab,evenh/docker-gitlab,patope/docker-gitlab,iamchanghyunpark/docker-gitlab,nicolasgnr/docker-gitlab,crobays/docker-gitlab,revayd/docker-gitlab,M0E-lnx/gitlab-32bit,maikelvl/docker-gitlab,ldgeo/docker-gitlab,jrjang/docker-gitlab