dropwizard / dropwizard / 3325

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Add support for HTTP client managed by DropwizardAppRule (#1891)

A common use case for the users of `DropwizardAppRule` is creating an HTTP
client which performs requests against the tested server. I think we could
make it little bit easier by providing a method for `DropwizardAppRule`
which creates a new Jersey HTTP client client managed by the rule. The user
doesn't need to care about creating own client and shutting it down. The
created is also have default sane timeouts in contrary to the default
Jersey client. In the end, this allows to write tests like that:

```java
RULE.client().target("http://localhost:" + RULE.getLocalPort() + "/hello-world")
    .queryParam("name", name.get())
    .request()
    .get(Saying.class);
```

It makes testing easy for users who don't use the dropwizard-client module or
 find it excessive for testing.

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