Improve Glance profiling

Put osprofiler middleware as a almost first middleware.
This allows us to:
1) Get more preciese duration. We are measuring duration of all middlewares.
2) authenticate middleware is requesting keystone, so if we init osprofiler
   before this middleware, we will get trace infomration from keystone as well.

Change-Id: I11c5d21e6e6b0bd514dee295da410b208d7c798c
Merge "Improve Glance profiling"