Update global requirments
Imporove profiler and add UTs

Adding two new commands start() & stop() that actually
calls profiler.start() profiler.stop() if it is presented.

Add unit tests for profiler
Remove from sqlachemy.after_execute notifcation resutls and add UTs

Mostly this patch just covers by UTs sqlalcehmy module
Fix WSGI middleware and add unit tests

Add unit tests to cover osprofiler.web module

* Fix bug in add_trace_id_header
* Add enabled parameter for WSGI Middleware
* Small refactoring of WSGI Middleware