Merge pull request #8 from uvbhat11/master

Rspec integration review comments  for dell_Iom incorporated
For defect No:ASM-1003
IOA module changes
1.For a VLAN- can’t untagged an interface which is already tagged and also can’t tag an interface which is already untagged :fixed
2.untagged interfaces can only belong to one VLAN at a time:IOA switches are taking care of the scenario.no code changes required.