examples/ip_pipeline: add sample configurations and scripts

examples/ip_pipeline: add sample configurations and scripts

This patch includes the configuration and script files of the some
applications which can be built using DPDK Packet Framework. A
configuration file defines the application structure which include
packet processing stages (knowns as pipelines), their connectivity
and other parameters necessary to start and run the application. A
script file specifies CLI commands required for loading table entries
(rules/routes, etc). The configuration/script files for simple
applications such as l2 forwarding, l3 forwarding have been presented.
In addition, to demonstrate the use and inter-connectivity of various
pipeline modules (which are avilable in packet framework), a complex
packet processing workload i.e. edge router is considered. The
configuration of the pipeline stages used for upstream and downstream
flow processing has been specified separately in two configuration
files. All these configuration and script files don't affect the
compilation.

Signed-off-by: Jasvinder Singh <jasvinder.singh@intel.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>