vlserver: use the logging function to log

vlserver: use the logging function to log

Use the logging function to log instead of printf.

Change-Id: I377474881830152c93122bd3112e355ab5fd56ad
Reviewed-on: http://gerrit.openafs.org/7895
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Alistair Ferguson <alistair.ferguson@mac.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit beb8f07496f59a19621bb0db14b401107888de35)

Change-Id: I246610abc3a6c2e164e0f368bc75a671f5f52e4d
Reviewed-on: http://gerrit.openafs.org/8208
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>