bozo: increase salvage instance poll rate

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.

Change-Id: Ia0f48bfabae9442ab0f1b4a6f43df34699892f66
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>