toaster: Start Django machinery for database access

toaster: Start Django machinery for database access

buildinfohelper, with the new import paths for our Django models
and Django 1.8, was not getting an active connection to the database.

In buildinfohelper, call django.setup() explicitly to make sure
that the database connection is ready and models can be queried
and saved.

[YOCTO #8364]

Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: brian avery <avery.brian@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>