HY-721: Don't Run jshint When Watching test or integration

When running the `test` and `integration` tasks, a watch is started.
This watch incorrectly runs `jshint` on file changes. It should not.

#### [JIRA Ticket](https://jira.webfilings.com/browse/HY-721)

Unit Tests
-------------

- None needed

How To +10/QA
-------------

```bash
# skip the following steps if you've already initialized the project
$ git clone git@github.com:WebFilings/wf-grunt.git
$ cd wf-grunt

# do not skip these!
$ git fetch && 
git checkout HY-721_no_lint_on_watches_for_test && 
./init.sh && 
grunt qa
```

- Should see no console errors.

@lancefisher-wf 
@patkujawa-wf 
@robbecker-wf 
@nathanevans-wf (cause we need a body :))