Configure interface offloading capabilities properly

[roland-sipos]

Currently by default the ifaces are initialized with these default/expected offloading:

dpdklibs/include/dpdklibs/EALSetup.hpp

Line 40 in 8756f22

.offloads = (RTE_ETH_RX_OFFLOAD_TIMESTAMP

This might not be available on every NIC (e.g.: 10Gb interfaces).
Problem was reported during the testing with Intel X722 10Gb OCP NIC at the 50L prototype.

We need to find a way to:

• Identify offloading capabilities of the interface
• Enable/use available offloading capabilities specified in configuration
• Throw issues accordingly: error on configured/expected but not available, or introduce "enable if available" options.