[util][netutil] Port wait from it from benchhub

[at15]

While cleaning up benchhub (got too many chores ..) found the wait for it package that is often used to wait for a tcp/http port to be ready. It is useful for one time benchmark, not that useful for actual database connection because you need to retry and backoff etc.

Also a waitforit binary and docker image can be useful. The waitforit should use static link so it can run using busybox/scratch container

[at15]

The original code is at https://github.com/benchhub/benchhub/tree/master/_legacy/lib/waitforit

Also found a interesting one in dyweb/go.ice#56 https://github.com/testcontainers/testcontainers-go/tree/master/wait

Might have a dedicated wait package and have gommon wait and a dedicated cmd/waitforit (or maybe waitonme to reduce binary size