Upgrade OVS to 3.x in Linux image

[antoninbas]

In #5120, we updated OVS to 3.0.5 for Windows.

We should also update to OVS 3 in Linux images (Ubuntu / UBI), for consistency.

Refer to https://github.com/openvswitch/ovs/blob/master/NEWS for changes in OVS 3. The reason for the major version bump seems to be a non fully backwards-compatible change in libopenvswitch. This should not affect us.

[wenyingd]

Hi @antoninbas the latest released OVS is 3.2.0, do we need to keep on 3.0.X or to the latest?

[antoninbas]

No strong preference for me.

I see a change in 3.2 that might impact Antrea downgrade operations, I don't know if this is an actual concern:

Changed format in which ovsdb schema conversion operations are stored in
clustered database files. Such operations are now allowed to contain
the bare schema (without data). This allows to significantly improve
the schema conversion performance.
New ovsdb-server process will be able to read old database format, but
old processes will fail to read database created by the new one, if
conversion operation is present. For the cluster service model follow
upgrade instructions in 'Upgrading from version 3.1 and earlier to 3.2
and later' section of ovsdb(7).

BTW, for Windows we are supposed to be using OVS "v3.0.5", but I don't see that tag upstream: https://github.com/openvswitch/ovs/tags

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