Fix Nondeterministic Ordering in Tests

[leejwook96]

The following tests:
org.springframework.ws.wsdl.wsdl11.DefaultWsdl11DefinitionTest#testSoap11And12 org.springframework.ws.wsdl.wsdl11.DefaultWsdl11DefinitionTest#testImport org.springframework.ws.wsdl.wsdl11.DefaultWsdl11DefinitionTest#testInclude org.springframework.ws.wsdl.wsdl11.DefaultWsdl11DefinitionTest#testSingle org.springframework.ws.wsdl.wsdl11.Wsdl4jDefinitionTest#testGetSource

are flaky tests. .areIdentical() not only compares the elements in XML, but also checks its order making the tests flaky.

To fix this, instead of using .areIdentical or isIdentical, we used .areSimilar or isSimilar since the order of the generated XML can be different every time.

Build and unit tests pass:

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[leaqui]

hi @leejwook96, this issue with areIdentical() was attended at #122, with migration to XMLUnit 2.6.2.

#122 was included in #1104 and planed for 3.1 Milestone