RXOSD and VICEP-ACCESS fields and bits in afs.h

RXOSD and VICEP-ACCESS fields and bits in afs.h

struct vcache gets two new fields:
int protocol
        which in the lower 16 bits contains the protocol number
                1 classical rx-fileserver,
                2 rxosd,
                4 direct access to visible vicep partitions.
void *vpacRock
        which for visible files in a vicep-partition contains
        a pointer to a struct known only inside afs_vicep.c
        which contains the pointer to the open file and other
        information.

Change-Id: I9d471a010d99bfa53ac59be3e7daad72e29d02ee
Reviewed-on: http://gerrit.openafs.org/3013
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>