The Build Appliance is missing the necessary modules (mainly Django) which Toaster needs in order to start up. we need to 1) add pip3 to the stuff we install in the Build Appliance 2) run "$ pip3 install --user -r bitbake/toaster-requirements.txt" to get the necessary modules installed for the Build Appliance user. If desired, we could also just do "$ pip3 install -r bitbake/toaster-requirements.txt" as root and have the modules installed at the system level.
Sent patch to the mailing list: http://lists.openembedded.org/pipermail/openembedded-core/2016-December/130668.html
Patch merged with master: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=4028407326f18c9059d6227de150100962656310
Verified in 381897c64069ea43d595380a3ae913bcc79cf7e1