[coxsim]

Currently JavaGeneratorTest fails when run in isolation as it uses schemas (like code-generation-schema.xml) with reserved Java keywords. The test suite passes when run with other tests that set the system property sbe.keyword.append.token and do not clear it after their tests finish.

For example:

Invalid property name='false' please correct the schema or consider setting system property: sbe.keyword.append.token
java.lang.IllegalStateException: Invalid property name='false' please correct the schema or consider setting system property: sbe.keyword.append.token
	at uk.co.real_logic.sbe.generation.java.JavaUtil.formatForJavaKeyword(JavaUtil.java:179)
	at uk.co.real_logic.sbe.generation.java.JavaGenerator.generateEnumValues(JavaGenerator.java:2284)
	at uk.co.real_logic.sbe.generation.java.JavaGenerator.generateEnum(JavaGenerator.java:2006)
	at uk.co.real_logic.sbe.generation.java.JavaGenerator.generateTypeStubs(JavaGenerator.java:209)
	at uk.co.real_logic.sbe.generation.java.JavaGenerator.generate(JavaGenerator.java:258)
	at uk.co.real_logic.sbe.generation.java.JavaGeneratorTest.shouldHandleLowerCaseEnumValueReference(JavaGeneratorTest.java:847)

This change sets the append token property before each test and restores it to the previous value after each test.