fix(agoric-cli): increase integration-test timeout

Now that spawner uses createVat() (#1343), deploys to the solo machine take
longer. The integration test was allowing 60s for `agoric deploy
./contract/deploy.js ./api/deploy.js` to work, and that used to take 47s on
my local machine, but now it takes 76s, and would exceed the timeout.

I increased the timeout to 120s to fix this.

When we switch vats to use XS, this should be dramatically faster (about
10x), so we'll have have plenty of margin.

packages/agoric-cli/integration-tests/test-workflow.js

@@ -132,7 +132,7 @@ test('workflow', async t => {
     ]);
     finalizers.push(() => pkill(deployP.childProcess, 'SIGINT'));
 
-    timeout = setTimeout(deployResult.resolve, 60000, 'timeout');
+    timeout = setTimeout(deployResult.resolve, 120 * 1000, 'timeout');
     const done = await Promise.race([deployResult.promise, deployP]);
     t.is(done, 0, `deploy successful before timeout`);
     clearTimeout(timeout);