packaging: cleanups

- Solved rpmlint issues:
 W: hidden-file-or-dir /etc/ovirt-engine/logcollector.conf.d/.keep
 E: zero-length /etc/ovirt-engine/logcollector.conf.d/.keep
 W: non-conffile-in-etc /etc/ovirt-engine/logcollector.conf.d/.keep
 W: manual-page-warning /usr/share/man/man8/engine-log-collector.8.gz
    28: name expected (got a special character): treated as missing

- Fixed BuildRoot tag for EPEL-5 compatibility

- Solved distcheck issues:
  - Added missing README.localization to the package
  - Removed LICENSE file, COPYING already provided
  - Added missing src/tests.py to the package

Change-Id: I2b11a1eb73c02b87a8fd41954254f1031dfb1cdf
Related-To: https://bugzilla.redhat.com/831878
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>