From 28.0.0, don't migrate per-endpoint sysctls

[robmry]

- What I did

• related to Per-interface sysctls #47686
• related to Migrate per-endpoint sysctls until 28.0.0 #48281
• closes Stop migrating per-interface sysctls from '--sysctl' #48282

Now we know the API version for release 28.0.0, disable migration of per-endpoint sysctls from that version.

- How I did it

Re-added checks that were removed until 28.0.0's API version was known, in commit 17adc14

- How to verify it

Unit test.

- Description for the changelog

- In API version 1.48 and later, settings for `eth0` in `--sysctl` options will no longer be automatically migrated to the network endpoint. For example, on the command line in a docker run command, `--network mynet --sysctl net.ipv4.conf.eth0.log_martians=1` will be rejected. Instead, you must use `--network name=mynet,driver-opt=com.docker.network.endpoint.sysctls=net.ipv4.conf.IFNAME.log_martians=1`

[thaJeztah]

LGTM, thanks!