gitlab: Update software to gitlab 8.8

Update GitLab software to

    - gitlab-ce 8.8.9 + NXD patches

    - gitlab-shell stays at 2.7.2 + 1 patch to remove unneeded hooks.old in *.git
      because gitlab-ce 8.7.x sticks to this version (i.e. no shell upgrade for
      gitlab 8.7 -> 8.8)

    - gitlab-workhorse stays at 0.7.1 + NXD patches because gitlab-ce 8.8.x
      sticks to this version (i.e. no workhorse upgrade for gitlab 8.7 -> 8.8)

This only updates software and begins SR update to 8.8 - for now gitlab
instance starts using gitlab-ce appropriate version.