public static List<String[]> splitOnLastColon(List<String> listToSplit) {
        if (listToSplit != null) {
          return Lists.transform(listToSplit, SPLIT_ON_LAST_COLON);
        }
        return Collections.emptyList();
    }
Splits every element in the given list on the last colon in the name and returns a list with
two elements: The left part before the colon and the right part after the colon. If the string
doesn't contain a colon, the value is used for both elements in the returned arrays.

@param listToSplit list of strings to split
@return return list of 2-element arrays or an empty list if the given list is empty or null
src/main/java/io/fabric8/maven/docker/util/EnvUtil.java