SAK-28098

Switch to using VND-IMS-ACKNOWLEDGE-URL as the acknowledgement pattern
for Re-Registration



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@315609 66ffb92e-73f9-0310-93c1-f5514f145a0a
NOJIRA

Tighen up code to make it clearer that reg_key will become 
the oauth_consumer_key.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@315610 66ffb92e-73f9-0310-93c1-f5514f145a0a