packaging: cleanups

- Aligned Requires with 1.1 branch
- Added missing BuildRequire on vdsm-cli needed for %check
- Fixed PEP8 issues detected by python-pep8-1.5.6-3

Change-Id: I5b77dd51b58ef2986cca95f51a15c3df2870faa8
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>