Since the 30.01.2017 the SVN plugin support additional-credentials, but the jenkins-job-builder can't generate this part:
<additionalCredentials>
<hudson.scm.SubversionSCM_-AdditionalCredentials>
<realm>...</realm>
<credentialsId>...</credentialsId>
</hudson.scm.SubversionSCM_-AdditionalCredentials>
<hudson.scm.SubversionSCM_-AdditionalCredentials>
<realm>...</realm>
<credentialsId>...</credentialsId>
</hudson.scm.SubversionSCM_-AdditionalCredentials>
</additionalCredentials>
Now you have optional 'additional-credentials' parameters.
Change-Id: I801cada4bd630242a216a1facc4abfc8d5378bcf
Task:4884
Story:2001152