Skip OVS module compilation for kernels newer than 5.5
Skip OVS module compilation for kernels newer than 5.5

For now OVS doesn't support compilation of kernel module
for kernels newer than 5.5 [1].
Recently Fedora 31 upgraded the kernel to 5.6.8 and that is
why the periodic jobs started to fail [2].
By default we enabled OVS module compilation because Ubuntu
Bionic one doesn't have support for Openflow Meter actions.

In case flag OVN_BUILD_MODULES is set to True and kernel is
newer than 5.5 lets skip the module compilation with proper log.

Closes-Bug: #1877377

[1] https://zuul.openstack.org/builds?job_name=neutron-ovn-tempest-ovs-master-fedora
[2] https://github.com/openvswitch/ovs/commit/59e994426645358a271a0c9f485e9defafffd474

Change-Id: I63b2f198468c9e30af8284c8033fa31f2af2518a

mahak/neutron,openstack/neutron,mahak/neutron,openstack/neutron,mahak/neutron,openstack/neutron