viced: remove obsolete comment about alignment

Alignment may have been historically relevant, but is no longer.
Remove the comment.

Also remove the unneeded 'dummy' field which does not provide
padding for a useful alignment.

Change-Id: I447fb73c379e6f86facd955a29ffd80e8929ceff
Reviewed-on: http://gerrit.openafs.org/11289
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Perry Ruiter <pruiter@sinenomine.net>
Reviewed-by: D Brashear <shadow@your-file-system.com>
viced: move host tmay fields before index

The index field and those after it in struct host do not get zeroed
when a host is reused.  The placement of the tmay fields after index
in commit 9a0a8ca4d186cf953b87d9fae1a35f66090b060c results in the
use of uninitialized memory.

This change moves the tmay fields before index which permits
the HOST_TO_ZERO() macro to compute the correct size to be memset()
to zero.

Change-Id: I1f93bebb23c99eaa7826dafa8cd7497d1b49bb53
Reviewed-on: http://gerrit.openafs.org/11286
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: D Brashear <shadow@your-file-system.com>