Options.py: Fix database OPTIONS parsing

Instead of parsing key/value pairs from bcfg2.conf, this allows the
setting of the literal value which is then passed through to django as
the value of the OPTIONS setting.

This change allows for setting arbitrary options since some settings
require nested dictionaries, etc.

Signed-off-by: Sol Jerome <sol.jerome@gmail.com>
Merge branch 'fix-django-db-options-parsing' into maint