replace use of netcat in the test suite with something less fragile.

[kwannoel]

In GitLab by @isd on Sep 7, 2021, 03:53

We've had problems with the use of nc in the integration tests, for a couple reasons:

• The try/finally macros we're using don't seem to run on SIGTERM, so that can leave processes running after glow has been killed.
• There are different versions of netcat with incompatible flags on different systems.

We should replace this with something more robust, perhaps in-process network support. I don't really anticipate in the long term that invoking glow with --handhsake will be common.

[kwannoel]

In GitLab by @isd on Sep 7, 2021, 03:54

mentioned in merge request !168