Windows: cm_AddCellProc always call cm_NewServer

Windows: cm_AddCellProc always call cm_NewServer

The current implementation of cm_NewServer handles races and
collisions.  There is no need to perform a cm_FindServer() check
first.  Just call cm_NewServer() for all server entries.

Move the logging of server creation and cell assignment to
cm_NewServer().

Change-Id: If0cdb2eda9bcb6234eeaef7c2a35edf751a9c0ca
Reviewed-on: http://gerrit.openafs.org/10775
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>