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.

software/gitlab/software.cfg

@@ -113,15 +113,15 @@ git-executable = ${git:location}/bin/git
 <= git-repository
 #repository = https://gitlab.com/gitlab-org/gitlab-ce.git
 repository = https://lab.nexedi.com/nexedi/gitlab-ce.git
-# 8.7.X + NXD patches:
-revision = v8.7.9-10-g7728df66b90483dac467df95948a532783e782c8
+# 8.8.X + NXD patches:
+revision = v8.8.9-10-g967afbdc3a2d2bcc58ed31ca50d5293fa2a2e9ed
 location = ${buildout:parts-directory}/gitlab
 
 [gitlab-shell-repository]
 <= git-repository
 #repository = https://gitlab.com/gitlab-org/gitlab-shell.git
 repository = https://lab.nexedi.com/nexedi/gitlab-shell.git
-# gitlab 8.7 wants gitlab-shell 2.7.2
+# gitlab 8.8 wants gitlab-shell 2.7.2
 # 2.7.2 + NXD patches
 revision = v2.6.10-50-gfbca95be784816349abc5930324659151eca50d1
 location = ${buildout:parts-directory}/gitlab-shell
@@ -130,7 +130,7 @@ location = ${buildout:parts-directory}/gitlab-shell
 <= git-repository
 #repository = https://gitlab.com/gitlab-org/gitlab-workhorse.git
 repository = https://lab.nexedi.com/nexedi/gitlab-workhorse.git
-# gitlab 8.7 wants gitlab-workhorse 0.7.1
+# gitlab 8.8 wants gitlab-workhorse 0.7.1
 # 0.7.1 + NXD patches
 revision = v0.7.1-5-gd23a3247829fc3200e3dc784dcd57b5a0febac48
 location = ${buildout:parts-directory}/gitlab-workhorse