bozo: increase salvage instance poll rate

Increase the bos client poll rate of the salvager temporary bnode
instance status, from every 5 seconds to 1 second.  This reduces the
minimum time bos salvage takes, from 5 seconds to 1 second, which
can add up when doing a large number of volume salvages.

Reviewed-on: http://gerrit.openafs.org/7231
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Tom Keiser <tkeiser@sinenomine.net>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit 2460e132a9ed63714754745fe24f6f3a5712c81d)

Change-Id: Ic86d3f3ed5791f880b41533edcd405a8fec24c0b
Reviewed-on: http://gerrit.openafs.org/9476
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>