redhat: package volscan

Add volscan and the manual page to the files in the server package.

Change-Id: I97c210da1e0d9d28682e555e92863c4c408b94da
Reviewed-on: http://gerrit.openafs.org/11370
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>