viced: Check vnode length on Rename and Link

viced: Check vnode length on Rename and Link

Commit 2578555d7e08131bf2fe4cdd0aa4b32567a76eb2 added vnode length
checks when we create or remove vnodes, but not during Rename and Link
operations (when vnodes are neither created nor destroyed). Add the
check in Rename and Link.

Reviewed-on: http://gerrit.openafs.org/4668
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 6df5547a7b93af74bc49ec8d4678aafd646dda1b)

Change-Id: I795407a143a56f26c0679b929763ebdc9c633e7a
Reviewed-on: http://gerrit.openafs.org/6298
Tested-by: Derrick Brashear <shadow@dementix.org>
Reviewed-by: Derrick Brashear <shadow@dementix.org>