vlserver: VL_GetEntryByName* requests undercounted

vlserver: VL_GetEntryByName* requests undercounted

Commit a14e791541bf19c6c377e68bc2f978fba34f94b1
refactored and corrected the counting of requests and aborts.
However, it inadvertently introduced a new undercount for
VL_GetEntryByName* requests, counting them only if
NameIsId(volname), e.g. volname="536870911".

Ensure that the normal case of a non-"numeric" volname is
also counted.

Discovered during review of pullup to 1.6.x.

Change-Id: Ic5dbc1a5871d0e0ff184dc4f3b11e92166c92f65
Reviewed-on: http://gerrit.openafs.org/12106
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>