Add implicit _* -> _* mapping
This adds an always-active mapping of internal attributes to the mapped
dict.
These can still be overriden by the admin, but it makes sure that we
always have them at least.
Fixes: #242
Merges: #248
Signed-off-by: Patrick Uiterwijk <puiterwijk@redhat.com>
Reviewed-by: Randy Barlow <randy@electronsweatshop.com>