Upgrade jackson library from 1.9.4 to 1.9.13

The ipVersion enum of Subnet is not supported by Jackson mapper library 1.9.4. 
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org.codehaus.jackson.map.JsonMappingException: Parameter #0 type for factory method ([method valueOf, annotations: {interface org.codehaus.jackson.annotate.JsonCreator=@org.codehaus.jackson.annotate.JsonCreator()}]) not suitable, must be java.lang.String