TestFunctionsForVoltDBSuite: deleted test methods related to JSON, which
have been moved to new TestFunctionsForJSON class, including: loadJS1,
testFIELDFunction, testARRAY_ELEMENTFunction, testARRAY_LENGTHFunction,
testFunctionsWithInvalidJSON, and portions of suite() related to JSON.
Added new test class TestFunctionsForJSON, including new methods
testFIELDFunctionWithDotNotation, testFIELDFunctionWithIndexNotation &
testFIELDFunctionWithDotAndIndexNotation (all to test ENG-6620); plus
methods moved from TestFunctionsForVoltDBSuite: loadJS1,
testFIELDFunction, testARRAY_ELEMENTFunction, testARRAY_LENGTHFunction,
testFunctionsWithInvalidJSON.