runner: Refactor metadata parsing

To aid testing function parsing metadata.txt is split into outer helper
that operates on dirfd and inner function that operates on FILE*.

This allows us to test the parsing using fmemopen(), limiting the amount
of necessary boilerplate.

Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>

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