SWITCHYARD-1984 Repaired xml soap file for SOAPMessageCredentialExtractorTests to workaround bug on IBM JVM

Repaired xml soap file for SOAPMessageCredentialExtractorTests to workaround bug on IBM JVM.

Now following unit tests on IBM JVM 1.6 and 1.7 should work:

org.switchyard.security.context.SecurityContextTests.testCredentialsSealable
org.switchyard.security.context.SecurityContextTests.testContextSerializable
org.switchyard.security.credential.extractor.SOAPMessageCredentialExtractorTests.testBinarySecurityToken