Napatech 3GD Support

Napatech 3GD Support

For use with Network Cards from Napatech utilizing the 3GD driver/api.

    - Implemented new run modes in runmode-napatech-3gd.*
    - Implemented capture/decode threads in source-napatech-3gd.*
    - Integrated the new run modes and source into the build infrastructure.

    New configure switches
    --enabled-napatech-3gd : Turns on the NT 3GD support
    --with-napatech-3gd-includes : The directory containing the NT 3GD header files
    --with-napatech-3gd-libraries : The directory containing the NT 3GD libraries to link against.

    New CLI switch
    --napatech-3gd : Uses the Napatech 3GD run mode

    Runmodes Supported:
    - auto
    - autofp
    - workers

    Notes:
    - tested with 1 Gbps sustained traffic (no drops)

Signed-off-by: Matt Keeler <mk@npulsetech.com>