Ironic upgrade process has pre-requirement that ironic-conductors
should be upgraded before ironic-api. Grenade is launched on primary
node, where we have ir-api and ir-cond runnning. Do not start ir-api
on primary node after upgrade to avoid situation when we have new ir-api
(primary) and old ir-cond (subnode) as it is not allowed by upgrade
procedure. Instead redirect all requests destinied to ir-api on primary
node to subnode.
Depends-On: I026121121059768aa74389add7eee6e63fdb214d
Change-Id: I9e496353a1d3d6547e4881f96fb187e488cff83f
fdf6f89a23