run-services.js: explicitly turn off --with-passphrase flag on principal create

This flag currently defaults to false, but we want to make it true insted.

Change-Id: I90f8665ba07e689b6d010664d9877a20f683d7c2
diff --git a/test/services/run-services.js b/test/services/run-services.js
index faf80d2..1b8166a 100644
--- a/test/services/run-services.js
+++ b/test/services/run-services.js
@@ -99,7 +99,8 @@
     }
     runner.env.V23_CREDENTIALS = path.resolve('tmp/test-credentials');
     service('principal')
-      .exec('create -overwrite ' + runner.env.V23_CREDENTIALS + ' test',
+      .exec('create -with-passphrase=false -overwrite ' +
+             runner.env.V23_CREDENTIALS + ' test',
 	          function(err, stdout, stderr) {
               if (err) {
                 return runner.emit('error', err);