bash scripts: remove useless cat
    
    upstream: fedora
    resolves: bz2003832
    conflict:
        load_kdump_kernel_key() didn't present in rhel9,
        so removed the patch for it.
    
    commit 6d45257cc15b3a5b28ed3bfdacb06af065aaecb7
    Author: Kairui Song <kasong@redhat.com>
    Date:   Wed Aug 4 15:14:00 2021 +0800
    
        bash scripts: remove useless cat
    
        Some `cat` calls are useless, remove them to make it cleaner.
        See: https://github.com/koalaman/shellcheck/wiki/SC2002
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
        Acked-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>