Test for output being indented by default value if not stated implicitly.
    
    Test checks whether output json-line string is indented by default value
    if this value is not stated implicitly. Test compares healthcheck
    produced json-like string with manually indented one.
    
    Automates: 02272ff39d76f1412483c5e3289564c93d196a03
    Signed-off-by: Michal Polovka <mpolovka@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>