Support NAT across multiple interface pairs

Support NAT across multiple interface pairs

    Some of the commands require interface name as an
    additional parameter as we support multiple interfaces.
    Example:
    set vcgn map inside TenGigabitEthernete/0/0 10.1.0.1 - 10.1.0.1
    show vcgn inside-translation protocol tcp interface TenGigabitEthernete/0/0 inside-addr 1.0.0.2
    show vcgn outside-translation protocol tcp interface TenGigabitEthernet9/0/0 outside-addr 10.1.0.1

Change-Id: Id691ccd3f2c863c665a1568982c819b79dda007e
Signed-off-by: Shesha Sreenivasamurthy <shesha@cisco.com>