Added test cases for not allowed validator, Handled invalid keyword test case for recurisve reference and empty array case for prefixItems validator, Performed refactoring for code improvments in InetAddressValidatorClass, DurationFormat, TimeFormat, BaseJsonValidator, AbstractSchemaTestSuite.

Added test cases for not allowed validator, Handled invalid keyword test case for recurisve reference and empty array case for prefixItems validator, Performed refactoring for code improvments in InetAddressValidatorClass, DurationFormat, TimeFormat, BaseJsonValidator, AbstractSchemaTestSuite. #270