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>
Windows: Support arbitrary callback ports

Reconfigure the advanced firewall to support callback ports
other than port 7001.

This changes the semantics of the afsicf api.  AFS_PORTSET_SERVER is now
zero.  Any other value is treated as a callback port.

Change-Id: I4df421cc0ceb4dca94a6b5e81990115a4ce0334e
Reviewed-on: http://gerrit.openafs.org/10776
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>