bitbake: toaster: Fix references to app paths

bitbake: toaster: Fix references to app paths

The buildinfohelper runs outside of Django, but still needs
access to our Django app classes.

Previously, the imports referenced the toaster.* app, which worked
fine. But in Django 1.8, this causes an error about the same
module being loaded multiple times from different paths.

Change the paths to our Django modules so they don't cause
this error to be thrown. We can do this as we've added our
application libraries to sys.path in the buildinfohelper anyway.

[YOCTO #8364]

(Bitbake rev: 070da64cf32c32b5ffc34d611b463c3a3960b419)

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>