volser: log host address of caller in extra logging

volser: log host address of caller in extra logging

When the volserver is running with extra logging (-log),
log the address of the host running vos in addition
to the user name.

Change-Id: I040be71a84dede255e43c30dd7d8ae56f767f721
Reviewed-on: http://gerrit.openafs.org/5234
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit cbdca2996af06c57cb3ba953c1efb9e316d18f27)
Reviewed-on: http://gerrit.openafs.org/8066
Tested-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>