Update submodule sync script

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

update-submodules.sh

@@ -26,7 +26,7 @@ for path in $paths; do
     git rebase master
   done
 
-  git checkout master
+  git checkout integration
   git push origin --all --force-with-lease
   git push origin --tags --force-with-lease