Increse api_max_retries and api_retry_interval for ironic

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
1 file changed