dpdk: support 18.11 changes to CRC flags
dpdk: support 18.11 changes to CRC flags

In DPDK 18.11 the device flags for keeping/stripping CRC flags has
changed. The old strip flag is gone, and replaced by a CRC keep
flag.

Change-Id: Iaa162854862a2a0855b418ee8029383fc116d3a2
Signed-off-by: Stephen Hemminger <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@networkplumber.org>

FDio/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp