Remove the unused fixture classes from the unit test framework.

neil_a_wilson

11.20.2006 b42b1ea4276efc0861a0f6592649fe6b3e3365ca

opends/tests/unit-tests-testng/src/server/org/opends/server/SingletonFixtureFactory.java does not exist in tree 2c1a8b46b41a38722dbdacc23a4431c6ba165d13