[1.2.X] Fixed #14356. Remove some dead imports from...

[1.2.X] Fixed #14356.  Remove some dead imports from django.core.management.sql.  Thanks to xiaket for the report and patch.  Backport of [14088].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14089 bcc190cf-cafb-0310-a4f2-bffc1f526a37