"require-input" config parameter ignored when using backend-drm

In cases where the DRM system is used, a flag was introduced in e57d8ae8 called "continue-without-input" that allows the system to run without an input device attached. This can be passed as a arg to weston. There already exists a current and older method to achieve the same via the configuration file using a parameter called "require-input."

The introduction of "continue-without-input" seems to render "require-input" moot since it takes precedence. It seems the former was introduced for test purposes, perhaps without realizing the impact this could have where users are relying on the latter config file param. I do not know the history here, so I wanted to open this for discussion.

I found this in version 9.0 when upgrading from 5.0 running on an embedded Linux system with a DRM back-end.