Merge pull request #7809 from bbodenmiller/patch-25

update gitlab shell to 1.9.8 for gitlab 7.2.2

doc/update/7.1-to-7.2.md

@@ -46,7 +46,7 @@ sudo -u git -H git checkout 7-2-stable-ee
 ```bash
 cd /home/git/gitlab-shell
 sudo -u git -H git fetch
-sudo -u git -H git checkout v1.9.7
+sudo -u git -H git checkout v1.9.8
 ```
 
 ### 4. Install new system dependencies