fd-net-device: Add DpdkNetDevice

Hrishi Hiraskarrequested to merge
hrily/ns-3-dev:master into master

We have implemented a new network device named DpdkNetDevice in ns-3. This is to improve the network emulation support in ns-3 by using Data Plane Development Kit (DPDK) to perform fast packet processing. With the help of DpdkNetDevice, ns-3 generated packets can bypass the kernel and can be directly sent to the NIC with the help of the DPDK framework.

The implementation, examples and documentation are added as single commits in incremental order.

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