Use XMLUtils.createDocumentBuilder method for DOM tests


Conflicts:
	src/test/java/javax/xml/crypto/test/dsig/TestUtils.java
	src/test/java/org/apache/xml/security/c14n/implementations/NameSpaceSymbTableTest.java
	src/test/java/org/apache/xml/security/test/c14n/implementations/Santuario273Test.java
	src/test/java/org/apache/xml/security/test/dom/c14n/implementations/Canonicalizer20010315ExclusiveTest.java
	src/test/java/org/apache/xml/security/test/interop/InteropTestBase.java
	src/test/java/org/apache/xml/security/test/signature/ECDSASignatureTest.java
	src/test/java/org/apache/xml/security/test/signature/ProcessingInstructionTest.java
	src/test/java/org/apache/xml/security/test/signature/UnknownAlgoSignatureTest.java

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/branches/1.5.x-fixes@1522985 13f79535-47bb-0310-9956-ffa450edef68