[Cherry-Pick 1.22] Add comparing PortRange in forwarding rules Equal function

[panslava]

This fixes bug in RBS that forwarding rule is not getting updated on port updates

/assign @swetharepakula
/assign @mmamczur

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In response to this:

This fixes bug in RBS that forwarding rule is not getting updated on port updates

/assign @swetharepakula
/assign @mmamczur

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[swetharepakula]

/lgtm

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