sos: aligned sos2 plugins to sos 3.1

Aligned sos 2 plugins shipped within log-collector with
the plugins included in sos 3.1 released in Fedora.

The new ovirt plugin also include support for ovirt-scheduler-proxy.

Aligned log-collector for using ovirt plugin.

Require newest sos ovirt rpm in order to update sos
previously shipped within ovirt repo.

Bug-Url: https://bugzilla.redhat.com/1073944
Bug-Url: https://bugzilla.redhat.com/1037663
Change-Id: I74b1d24cff897d6cc393ee68edfe0d78030877c5
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>