improve get_recommend_size
    
    Resolves: bz2074473
    Upstream: Fedora
    Conflict: None
    
    commit 4f702c81e9d14a90d22d6b587de37733d0126960
    Author: Coiby Xu <coxu@redhat.com>
    Date:   Thu May 12 10:48:31 2022 +0800
    
        improve get_recommend_size
    
        This patch rewrites get_recommend_size to get rid of the following
        limitations,
        1. only supports ranges in crashkernel sorted in increasing order
        2. the first entry of crashkernel should have only a single digit and
           it's in gigabytes
    
        Suggested-by: Philipp Rudo <prudo@redhat.com>
        Signed-off-by: Coiby Xu <coxu@redhat.com>
        Reviewed-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Coiby Xu <coxu@redhat.com>