[CONFIGURATION-558] Configuration no longer accepts List<String> as default for getList()

Similar to CONFIGURATION-557, the getList(String, List) method was
generified to be getList(String, List<Object>) but needs to be
getList(String, List<?>) so that code that used a more specific list
(such as a List<String>) still compiles against the new API.




git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/branches/CONFIGURATION_1_X_MAINTENANCE@1534064 13f79535-47bb-0310-9956-ffa450edef68