Fixed onos-secure-ssh to consider environment defaults.

Change-Id: I0efb3b4273c449a03246b518287328d151ce2a71
diff --git a/tools/test/bin/onos-secure-ssh b/tools/test/bin/onos-secure-ssh
index 9bd8881..45f0401 100755
--- a/tools/test/bin/onos-secure-ssh
+++ b/tools/test/bin/onos-secure-ssh
@@ -17,6 +17,8 @@
 let OPC=$OPTIND-1
 shift $OPC
 
+user=${user:-$ONOS_WEB_USER}
+password=${password:-$ONOS_WEB_PASS}
 nodes=${1:-$(env | sort | egrep "^OC[0-9]+" | cut -d= -f2)}
 
 # ensure known_hosts file exist