net/pcap: propagate timestamp from header to mbuf
net/pcap: propagate timestamp from header to mbuf

Timestamp is always set in PCAP header, whether it reads a file or
listen on an interface. This information can be important for some
applications and it cannot be obtained otherwise (especially when
reading a PCAP file, where the timestamp is not the current time).
Timestamp here is the number of microseconds since epoch.

Signed-off-by: Sylvain Rodon <24cd24e3d6e0fca1c51c32b711ace503d8ff2f4b@nexatech.fr>
Acked-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk