Hi,
for oVirt 4.0 we're going to drop backward compatibility with oVirt < 3.6,
you're kindly invited to cleanup the code dropping legacy support for older version.
More in detail, for 4.0 we'll assume:
 * Support for EL6 hosts will be dropped
 * oVirt Engine support for EL6 will be dropped
 * Upgrade / Migration (if oVirt Engine was running on EL6) will be supported only from oVirt 3.6
 * Network API support for oVirt < 3.6 will be dropped, the remaining API should be backward compatible 
 * oVirt Engine will support cluster compatibility >= 3.6 
 * We won't support in place upgrade for oVirt Engine from 3.6 EL6 to 4.0 EL7: we'll support only migration.
 * oVirt DWH will only have 3.6 \ 4.0 compatibility views in 4.0.

Thanks,

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Sandro Bonazzola
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