Add check_uptodate to tools/config

Add a script which can be used to validate a project's
sample config and ensure that it remains up to date on every commit.

Change-Id: Iee6cc05cad70963f2a151f595ac376c9338f5774
Adjust imports order of module log_handler

According to http://docs.openstack.org/developer/hacking/#imports,
adjust the imports order for module log_handler.

Change-Id: Ic0661e31cf810c2686016c015f6268918635ed99
Merge "Add check_uptodate to tools/config"
Merge "Adjust imports order of module log_handler"