[1.2.X] Fixed #14149: Initialize the Oracle connection.operators at connection...

[1.2.X] Fixed #14149: Initialize the Oracle connection.operators at connection time since some systems don't seem to like the "TRANSLATE" trick.

Backport of r15299 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15300 bcc190cf-cafb-0310-a4f2-bffc1f526a37