Merge kdump-error-handler.sh into kdump.sh
    
    upstream: fedora
    resolves: bz2003832
    conflict: none
    
    commit e7118d1de84b604b25b2f6332f4ae071a9dc08fd
    Author: Kairui Song <kasong@redhat.com>
    Date:   Mon Aug 2 00:50:22 2021 +0800
    
        Merge kdump-error-handler.sh into kdump.sh
    
        kdump-error-handler.sh does nothing except calling three functions,
        it can be easily merged into kdump.sh by using a parameter to run the
        error handling routine.
    
        kdump-lib-initramfs.sh was created to hold the three shared functions
        and related code, so by merging these two files, kdump-lib-initramfs.sh
        can be simplified by a lot.
    
        Following up commits will clean up kdump-lib-initramfs.sh.
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
        Acked-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>