When an error occurs in a flow, the provisioning status of the load
balancer should be set to ERROR in the revert method of the first task
of the flow. This update acts as an unlock of the LB object and cannot
occur in any other revert method because the API might consider the LB
as mutable before finishing a task/flow.
Remove all occurrences of mark_loadbalancer_prov_status_error calls in
revert method of tasks that are not specifically designed for unlocking
the load balancers. Add a LoadBalancerToErrorOnRevertTask task in the
amphora failover flow to prevent a LB to be in an immutable state.
Story 2009651
Task 43810
Story 2009652
Task 43811
Change-Id: I48b0f5a773209b1c1b056d71c0da05d6fd82ca73
(cherry picked from commit 4b8b198fecee802e1031c014f811eb766329a1a0)
4039d35ce2