SOAPUI-4586: fixes isue that BST could not be added to signature parts

SOAPUI-4586: fixes issue that BST could not be added to signature parts

SOAPUI-4586: fixes issue that BST could not be added to signature parts

SOAPUI-4586: fixes issue that BST could not be added to signature parts

SOAPUI-4430: fixes empty MajorVersion attribute in manual SAML assertion
(cherry picked from commit a5c40f5)