dynroot: mark vnode types on dynroot vnodes

dynroot: mark vnode types on dynroot vnodes

when we create a vnode using a dynroot fid, we weren't bothering
to update the type from the default (typically VREG); most
dynroot vnodes are actually VDIR...

Reviewed-on: http://gerrit.openafs.org/4686
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 0cf06f620213fa62abc16bf717779a1333ce12a0)

Change-Id: Ic0392216ca5da072022baa1388380f658d324df2
Reviewed-on: http://gerrit.openafs.org/4698
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>