BUG #17323: test_config_settings during postgres initialization does not read the parameter huge_pages

The following bug has been logged on the website:

Bug reference: 17323
Logged by: min zhang
Email address: min(dot)xx(dot)zhang(at)ericsson(dot)com
PostgreSQL version: 10.18
Operating system: SUSE linux
Description:

In the function test_config_settings() which will run during postgres
initialization, the logic will create a new process to test what default
parameters(such as max_connections, shared_buffers) can be set.

However, it seems the new process so called testing process does not take
the parameter huge_pages(in postgresql.conf.sample) into account.

In a K8s cluster environment, sometimes this will lead to the testing
process core dump.

So we write this bug report to make the testing process read the parameter
huge_pages to avoid core dump.

Thanks.