Noticed while running some tests that adding any kind of spaces into the
name of a test run would stop igt_resume from working for said test run.
Turns out that when we parse test metadata, we accidentally use the
'%ms' specifier with fscanf() which finishes parsing strings when any
kind of whitespace is encountered.

So, fix this by using the proper %m[^\n] specifier, which dynamically
allocates it's result and doesn't stop reading the string until a
newline is encountered. Additionally, add a test for this.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>