Merge branch 'update_upgrade_document' into 'master'

Update Upgrade Document for 6.7

Use the latest version of gitlab-shell which is 1.9.0

doc/install/installation.md

@@ -128,7 +128,7 @@ GitLab Shell is an ssh access and repository management software developed speci
     cd /home/git
     # Clone gitlab shell
-    sudo -u git -H git clone https://gitlab.com/gitlab-org/gitlab-shell.git -b v1.8.0
+    sudo -u git -H git clone https://gitlab.com/gitlab-org/gitlab-shell.git -b v1.9.1
     cd gitlab-shell

doc/update/6.6-to-6.7.md

@@ -37,7 +37,7 @@ sudo -u git -H git checkout 6-7-stable-ee
 ```bash
 cd /home/git/gitlab-shell
 sudo -u git -H git fetch
-sudo -u git -H git checkout v1.8.0
+sudo -u git -H git checkout v1.9.1
 ```
 ### 4. Install libs, migrations, etc.

lib/tasks/gitlab/check.rake

@@ -742,7 +742,7 @@ namespace :gitlab do
   end
   def check_gitlab_shell
-    required_version = Gitlab::VersionInfo.new(1, 9, 0)
+    required_version = Gitlab::VersionInfo.new(1, 9, 1)
     current_version = Gitlab::VersionInfo.parse(gitlab_shell_version)
     print "GitLab Shell version >= #{required_version} ? ... "