bash scripts: get rid of unnecessary sed calls
    
    upstream: fedora
    resolves: bz2003832
    conflict: none
    
    commit fdfad3102e0d0564a7f26f7a3f25596d12502481
    Author: Kairui Song <kasong@redhat.com>
    Date:   Wed Aug 4 15:46:27 2021 +0800
    
        bash scripts: get rid of unnecessary sed calls
    
        Use bash builtin string substitution instead, as suggested by:
        https://github.com/koalaman/shellcheck/wiki/SC2001
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
        Acked-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>