Add more API tests for port-security extension:

Add more API tests for port-security extension:

Test create port with specific value of port_security_enabled
Test create secure port with security_group attached
Test update port with port_security_enabled True\False
and with or without security groups
Test deleting port with port_security_enabled

Change-Id: Id71f5451dc17f374feff1a3bdb35fb9ec42f0fa1
Depends-On: Ia27881a34ff99cad34c84764d2bf8a6cdf77af9c
Depends-On: Ie0ec090e8fdce7dbdbce14ef47f38e8e57f262d4