Changed number of lso_interaction

Corrected sequence of interactions

to reflect changes in structrure of `migrate_iptrunk`

Change sequence of steps:
'restore_isis_metric' after 'update_subscription' in order to target the
correct set of nodes (remaining + new).

To reflect the changes in case of `Leased` trunk_type.

If trunk_type is Leased, then BFD must be configured on that trunk
according to the policy.
The steps that are added will update the target loopback address of BFD
config on the remaining side when trunk type is Leased, and will be
skipped when trunk type is Dark_fiber.