examples/ipsec-secgw: support header reconstruction

This patch updates the ipsec-secgw application to support
header reconstruction. In addition a series of tests have
been added to prove the implem

examples/ipsec-secgw: support header reconstruction

This patch updates the ipsec-secgw application to support
header reconstruction. In addition a series of tests have
been added to prove the implementation's correctness.

Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Tested-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

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