Switch to -u from deprecated --set-upstream

src/main/java/com/gitblit/wicket/pages/propose_git.md

     cd ${repo}
     git checkout -b ${reviewBranch} origin/${integrationBranch}
     ...
-    git push --set-upstream origin ${reviewBranch}
+    git push -u origin ${reviewBranch}
 

src/main/java/pt.py

             # set the upstream branch configuration
             args.id = int(fields[1].strip()[len('--> #'):])
             __call(['git', 'fetch', args.remote])
-            __call(['git', 'branch', '--set-upstream-to={}/ticket/{:d}'.format(args.remote, args.id)])
+            __call(['git', 'branch', '-u', '{}/ticket/{:d}'.format(args.remote, args.id)])
             break
 
     return

src/site/tickets_using.mkd

     ...add a single commit...
     git push origin HEAD:refs/for/new
     # read ticket id from server output
-    git branch --set-upstream-to=origin/ticket/{id}
+    git branch -u origin/ticket/{id}
 
 ### Creating the first Patchset for an Existing Ticket
 
     cd repo
     git checkout -b ticket/{id}
     ...add one or more commits...
-    git push --set-upstream origin ticket/{id}
+    git push -u origin ticket/{id}
 
 ### Safely adding commits to a Patchset for an Existing Ticket