Low: libcrmcommon: compare CRM_meta_ properly
    
    Previously, when filtering XML attributes for digests, we would filter
    attributes starting with "CRM_meta" case-insensitively. Now, compare
    against "CRM_meta_" case-sensitively.
    
    This could potentially cause resource restarts after upgrading to a version
    with this commit, for any resource that has instance attributes that start with
    something like "crm_meta" -- a highly unlikely scenario.