vos: Abstract out bulk list conversion

vos: Abstract out bulk list conversion

Pull the various segments of code that do bulk list conversion into
their own functions. This is purely code reorganisation at this point,
fixes for these functions will follow in subsequent patches.

Reviewed-on: http://gerrit.openafs.org/3595
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 3503f32848ab3fcb0df5a0b40518106bf19cee6e)

Change-Id: Ib6b32fe942f5083e18f32404156a42cd82bf5c5a
Reviewed-on: http://gerrit.openafs.org/3634
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>