Addresses issue #628, using reverse() and the newly created helper function
reverse_lazy() (found in ietf/utils/lazy.py) to DRY out the code a bit by
decoupling the urls from being hardcoded.
With this commit idrfc, and ipr modules have been modified to take advantage
of the reverse() and reverse_lazy() functions.
- Legacy-Id: 2956
Note: SVN reference [2948] has been migrated to Git commit 9399a2e0e8bbfe5c5a16781fd784776cfa31fbac
