shared/cpu-set-util: move the part to print cpu-set into a separate function
    
    Also avoid unnecessary asprintf() when we can write to the output area
    directly.
    
    (cherry picked from commit a832893f9c4f0a0329768e90f67e2fa24bb0008e)
    
    Related: #1734787
    
    patch_name: 0270-shared-cpu-set-util-move-the-part-to-print-cpu-set-i.patch
    present_in_specfile: true
    location_in_specfile: 270
    squash_commits: true