volser: repair volserver -udpsize and -sleep options

commit cd3492d0635708f141dbb9230471434268ef2188 accidentally
broke the parsing of the volserver -udpsize and -sleep options.

Change-Id: Ia900e4d8fda1b4d5759b46932a4b62bf5591707b
Reviewed-on: http://gerrit.openafs.org/10088
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>