[Satellite 6.2] While upgrading satellite v 6.1 to v 6.2, the upgrade fails at db:migrate with error "undefined method `execution' for #<Nic::Managed:0x0000000a8a02a0>" while migrating unmanaged host interface for a client system.

Issue

• While upgrading satellite v 6.1 to v 6.2, the upgrade fails at db:migrate with error "undefined method execution' for #<Nic::Managed:0x0000000a8a02a0>". Complete error message insatellite.log`:
  ~~~~
  Tasks: TOP => db:migrate
  (See full trace by running task with --trace)
  == 20150508124600 CopyUnmanagedHostsToInterfaces: migrating ===================
  -- Migrating Unmanaged Host interfaces to standalone Interfaces
  -- ... migrating client1.example.com

[ERROR 2016-10-11 10:39:20 main] /Stage[main]/Foreman::Database/Foreman::Rake[db:seed]/Exec[foreman-rake-db:seed]: Failed to call refresh: /usr/sbin/foreman-rake db:seed returned 1 instead of one of [0]
[ERROR 2016-10-11 10:39:20 main] /Stage[main]/Foreman::Database/Foreman::Rake[db:seed]/Exec[foreman-rake-db:seed]: /usr/sbin/foreman-rake db:seed returned 1 instead of one of [0]
~~~