There is no way to upgrade ironic before nova because of
grenade design. In multinode job we do not restart nova
as we test partial upgrade of ironic there.
On slow nodes upgrading ironic takes time and nova looses
ironic connectivity
This patch increases api_retry_interval and api_max_retries
to make sure we have a time to upgrade ironic before nova
compute stuck.
Change-Id: I3b1429d6561431a82edda04a0e574cac38771837
851bc53dfa