sparklens
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fix for exception while running sparklens with event history file in spark 2.4.0 and above.
- Sparklens is compiled against spark 2.0.0
- Spark 2.0.0 has a dependency on json4s 3.2.11 wherein Spark 2.4.0 onwards json4s 3.5.3 is used
- In the later version the method definition of org.json4s.JsonMethods.parse() has changed
- Fix uses reflection to resolve this backward incompatibility