[UIMA-6465] Check out code into subfolder of Jenkins workspace

- Disable default checkout
diff --git a/vars/defaultPipeline.groovy b/vars/defaultPipeline.groovy
index 6c4aa32..0ace24b 100644
--- a/vars/defaultPipeline.groovy
+++ b/vars/defaultPipeline.groovy
@@ -50,6 +50,7 @@
         numToKeepStr: '25',
         artifactNumToKeepStr: '5'
       ))
+      skipDefaultCheckout()
     }
       
     stages {