stalld: Respect -l option in single threaded mode

Fernando Pachecorequested to merge
pachecof/stalld:logonly-single-threaded into main

Running stalld -l -v results in an abrubt exit via die().

stalld: trying to open file /sys/kernel/debug/sched/debug returned -1
stalld: trying to open file /proc/sched_debug returned 4
stalld: initial config_buffer_size set to 573440
stalld: detected new task format
stalld: single threaded mode
stalld: No such file or directory
  single_threaded_main: Single threaded mode only works with SCHED_DEADLINE

Correct the -l behavior by adding guards around any config altering actions taken on behalf of single threaded mode.

Signed-off-by: Fernando Pacheco fpacheco@redhat.com

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