LP#1339118: Ignore permission checks for "jump" context

We don't worry about checking permissions on foreign objects when we're
simply using them to get a context OU for the local object permission
testing.  The "jump" field just gives us more layers of indirection, and
shouldn't cause a perm check, just like normal foreign context OUs.

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Ben Shum <bshum@biblio.org>