Increase size of space for ACL in "up" command.

The amount of space allocated for use by the pioctl call to
obtain the ACL for the source directory in the "up" command
is not large enough and the call fails when access lists get
sufficiently large.

This change increases the size of the space provided to
pioctl to the maximum possible. This allows for much larger
access lists and is consistent with a similar call in the
"fs listacl" command).

Reviewed-on: http://gerrit.openafs.org/9753
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 639453196dd9f71a86e61d2c83e2e8ae0d8bf45f)

Change-Id: I4fabbe3fc294c076bd786d43f5e9d2dd0b32e99d
Reviewed-on: http://gerrit.openafs.org/11111
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>