packaging: fix conflicts with ovirt-release34

fixes file /etc/pki/rpm-gpg/RPM-GPG-ovirt from install of
ovirt-release35-001-0.0.alpha1.noarch conflicts with file from package
ovirt-release34-1.0.0-1.noarch

Change-Id: I0b07bd273b9dc88224d4582e3d9c976230ce0c73
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>