Windows: Improve WKSSRC and SRVSVC compatibility with Windows

Windows: Improve WKSSRC and SRVSVC compatibility with Windows

This commit includes several changes to improve compatibility
with Windows (in particular Windows 2000).

1. Specify a Lan Workgroup name.  We use "AFS".

2. Ensure that the server name returned does not include
   leading slash or backslash characters.  The name provided
   might include them but they are not part of the name and
   cannot be returned.

3. The NetrWkstaGetInfo and NetrServerGetInfo responses must
   be consistent.  Otherwise, the Explorer Shell will get confused and
   refuse to provide access to the server shares.

This commit also includes some minor comment changes.

LICENSE MIT

Reviewed-on: http://gerrit.openafs.org/466
Tested-by: Asanka Herath <asanka@secure-endpoints.com>
Reviewed-by: Asanka Herath <asanka@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>