Fixed couple of other problems along:
* when expunge PF/Static nat rules as a part of vmExpunge/IpRelease process, first mark all rules as Revoke, and then send commands to the backend. Group commands by Ip address.
Before we used to do Revoke/Send per rule basis.
* When release source nat rule, make sure that corresponding vpn (if exists) is being expunged.
* to enable 1-1 nat for ip/vm use enalbeOneToOneNat api
* to open port range (or multiple port ranges) use createIpForwardingRule api.
* to delete one port range use deleteIpForwardingRule api.
* to disable 1-1 nat use disableOneToOneNat api.
* added new fields to createIpForwardingRule api: startPort/protocol - required, endPort is optional
* updated "firewall_rules" table with a new field "is_one_to_one_nat" (being set when new rule is created)