[Rpm-maint] [rpm-software-management/rpm] Use the real user/group name in BUILDROOT if we set %attr(-, -, -) explicitly (Issue #1933)

[licunlong]

We use rpmrebuild to rebuild rpm packages. And rpmrebuild provides `--keep-perm`  option which allows users to keep installed files permission, uid and gid in the new rebuilt package. rpmrebuild does this by specifing `%attr(-,-,-)` for each file in the spec file, and rebuilds the spec file by `rpmbuild`.

But apparently, this doesn't work well. `%attr(-,-,-)` will be reset to `%attr(-,root,root)` by `%defattr(-,root,root)`. In <http://ftp.rpm.org/max-rpm/s1-rpm-anywhere-specifying-file-attributes.html> it said:

> If a particular file attribute doesn't need to be specified, that attribute can be replaced with a dash "-" and %attr will not change it.

So I think may be rpm shouldn't change `%attr(-,-,-)` if we have explicitly  set it.

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