build: Require OpenSSL

refs: #2375

Change-Id: I0fe7c44b9e025bbe9a2e58cf0cab95069e668945
diff --git a/.jenkins.d/30-tests.sh b/.jenkins.d/30-tests.sh
index 433d450..633dfa7 100755
--- a/.jenkins.d/30-tests.sh
+++ b/.jenkins.d/30-tests.sh
@@ -2,4 +2,6 @@
 set -x
 set -e
 
+rm -Rf ~/.ndn
+
 ./build/unit-tests-nlsr -l test_suite