From:   Jakub Sitnicki <jakub@cloudflare.com>
Date:   Mon, 23 Jan 2023 15:44:40 +0100

Exercise IP_LOCAL_PORT_RANGE socket option in various scenarios:

1. pass invalid values to setsockopt
2. pass a range outside of the per-netns port range
3. configure a single-port range
4. exhaust a configured multi-port range
5. check interaction with late-bind (IP_BIND_ADDRESS_NO_PORT)
6. set then get the per-socket port range

v2 -> v3:
 * Switch from CPP-based templates to FIXTURE_VARIANT. (Kuniyuki)
 * Cover SOCK_STREAM/IPPROTO_SCTP where possible.

v1 -> v2:
 * selftests: Instead of iterating over socket families (ip4, ip6) and types
   (tcp, udp), generate tests for each combo from a template. This keeps the
   code indentation level down and makes tests more granular.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>

Reviewed-by: Kuniyuki Iwashima <redacted>