SPDX license tag nag

This is the current status of DPDK 19.11 about files with missing or incorrect SPDX tags. This is a polite nag, please either ack the patches, or merge them. If there is no patch please submit one if you are the author.

Several patches are outstanding to fix some of these. But others have not been addressed.

Pending:
https://patchwork.dpdk.org/patch/59769/
lib/librte_ethdev/rte_ethdev_pci.h lib/librte_ethdev/rte_ethdev_vdev.h
https://patchwork.dpdk.org/patch/59770/
app/test-pmd/flowgen.c app/test-pmd/macswap.c
https://patchwork.dpdk.org/patch/59771/
app/test/test_compressdev_test_buffer.h
https://patchwork.dpdk.org/patch/62802/
examples/performance-thread/l3fwd-thread/test.sh

Patches needed:
app/test/test_timer_racecond.c
devtools/cocci.sh
devtools/load-devel-config examples/ipsec-secgw/test/trs_aesgcm_inline_crypto_fallback_defs.sh examples/ipsec-secgw/test/tun_aesgcm_inline_crypto_fallback_defs.sh

The nagging will continue until all files are fixed.