Changed number of lso_interaction

Corrected sequence of interactions

to reflect changes in structrure of `migrate_iptrunk`

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

refactor site validation

Did a couple of adjustment for IP Trunk creation and modification. Added default values for nullable fields.

Don't raise exception when allocating existing host/network or deleting non-existent ones

Changed minimum links to number of members, added a confirmation page for the minimum links value and  made interface description optional.

An additional step for checking TWAMP status