Assumes in SPNEGOLoginModuleTestCase doen's make sense.

AssumeKerberosAuthenticationSupported is called in @Before method. Same method is called in many test methods:

testIdentityPropagation
testFormFallback
testSimpleSpnegoWorkflow
testMoreMechTypesSpnegoWorkflow

assumeKerberosAuthenticationSupported method from KerberosTestUtils.java shouldn't contains assume for BZ1188632, because BZ1188632 is fixed (works correctly with new version of IBM JDK).