contrib/jenkins.sh: dump submodule status before building

Change-Id: I0f9d8f9213fd59605172fac011306c96c39bd5eb
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index 584de07..728aab8 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -101,6 +101,7 @@
 set -x
 
 cd "$base"
+git submodule status
 autoreconf --install --force
 ./configure $CONFIG
 $MAKE $PARALLEL_MAKE