Lazy import BaseFreeAdmin due to changes in tastypie
Stop gap solution to JailsQuerySet symbol vanishing

For some obscure reason yet to be determined, after upgrading
tastypie the class JailsQuerySet is being set as None when the
manager get_query_set method is called.
As a stop gap solution split JailsQuerySet and lazy import it on
every get_query_set call
Merge branch 'master' of ssh://github.com/freenas/freenas