Netfilter hooks support and example #1719

Job	Run time
Run tcp_ca example	2m 3s
Test [stable, dev]	1m 28s
Build for aarch64	50s
Test [nightly, dev]	1m 49s
Build for aarch32	45s
Build capable example with static libelf and libz	36s
Test [stable, release]	2m 19s
Build [features = ['vendored']]	48s
Build using minimum versions of dependencies	1m 29s
Build [features = ['static']]	30s
Check documentation	1m 31s
Check code formatting	16s
Lint with clippy	1m 13s
	15m 37s

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