ci: sync code coverage script; add headers check

Change-Id: Idf31d4c029d0cc79f85c8ac8d4ed373d46c525dd
diff --git a/.jenkins.d/20-tests.sh b/.jenkins.d/20-tests.sh
index 13ddf6e..e0d2977 100755
--- a/.jenkins.d/20-tests.sh
+++ b/.jenkins.d/20-tests.sh
@@ -3,6 +3,7 @@
 
 # Prepare environment
 rm -rf ~/.ndn
+ndnsec key-gen "/tmp/jenkins/$NODE_NAME" | ndnsec cert-install -
 
 # https://github.com/google/sanitizers/wiki/AddressSanitizerFlags
 ASAN_OPTIONS="color=always"