Add Test to Create Port with no security groups

-Create a Port with no security groups
-Validate length of security group list is zero in response

Add Test to Update Port  with no security groups

-Create a Port with default security groups
-Validate length of security group list is not zero in response
-Update a Port with no security groups
-Validate length of security group list is zero in response

Change-Id: I965090417ef0719246cfdc2db6a9d33d4e78e326
Merge "Add Test to Create Port with no security groups"