samba should ignore backup configuration files

[Hans Ginzel]

Samba should ignore files like /var/lib/samba/usershares/name~ or name~1~ or name.~1~. Eg.
# net usershare info --long
info_fn: file /var/lib/samba/usershares/kb$~ is not a well formed usershare file.
info_fn: Error was Bad sharename (doesn't match filename).

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: samba-common-bin 2:3.6.9-1ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-29.21-lowlatency 3.8.13.5
Uname: Linux 3.8.0-29-lowlatency i686
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: i386
Date: Thu Aug 29 16:29:18 2013
MarkForUpload: True
NmbdLog:

OtherFailedConnect: Yes
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SambaServerRegression: No
SmbConfIncluded: Yes
SourcePackage: samba
UpgradeStatus: Upgraded to raring on 2013-08-11 (18 days ago)