add exit on error preamble to all JJB shell scripts

Change-Id: I3b463cc5ba5e835ac02b1a78e46418a3086f18d9
diff --git a/jjb/onos/onos-verify.sh b/jjb/onos/onos-verify.sh
index a26c8a0..b4d67ff 100755
--- a/jjb/onos/onos-verify.sh
+++ b/jjb/onos/onos-verify.sh
@@ -1,4 +1,8 @@
 #!/bin/bash -ex
+
+# exit on errors
+set -eu -o pipefail
+
 ONOS_ROOT=`pwd`
 . tools/build/envDefaults
 echo $PATH