Flows not added for TCP security group rule with no min/max

ODL version: Boron SR2

When add a simple TCP egress rule from command line, there is no flow added to the OVS even though karaf log shows the flow is written successfully.

Steps to reproduce:

• create network/subnet
• create SG sg1
• create egress TCP rule from command line below:

neutron security-group-rule-create --direction egress --protocol tcp --ethertype IPv4

• create vm1 with sg1
• expect: flow entries for allowing tcp egress from the vm added to the switch
• actual: no flow entries for allowing tcp egress added to the switch

This issue might happen for adding TCP ingress rule and UDP ingress/egress rules to VM as well.