uwsgi: move init_db to uwsgi entry point

uwsgi: move init_db to uwsgi entry point

uwsgi will call the 'callable' function which should normally be
Flask.__call__().

But we need to init the db first, so make a wrapper function that inits
the db and then calls app()

Also refactor add_resource into for loop instead of reduce.  reduce is
not really approriate here since we aren't consuming the return value

JIRA: YARDSTICK-543

Change-Id: I692d6d42de09f7d6ecf1a67a22e3019d97a4f3ca
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>