scripts/check-kernel-fix: Enhancements and cleanups
    
    Allow to check which branches have a given reference without
    passing a particular sha. Actions are not printed in this case.
    
    Show actions when "sha" is passed by default.
    
    Add [-q] option to do not show progress when checking
    state of each branch.
    
    Do not show action for a branch when the merge branch
    already has the patch with all references.
    
    Check each branch only once for the given sha and all references.
    It allowed to reduce git grep calls. Also it removed the need
    to merge branch states. It improved speed and simplified
    the logic.
    
    Signed-off-by: Petr Mladek <pmladek@suse.com>