[REQ] [Java] Swagger dependency old

Is your feature request related to a problem? Please describe.

Through this issue I'm forced to use different Swagger versions in my project, which leads to more dependencies and more knowledge, that developers at my company have to acquire about the different Swagger versions.

Describe the solution you'd like

In my pom.xml I want to have this:

        <dependency>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-annotations</artifactId>
            <version>2.1.1</version>
        </dependency>

Describe alternatives you've considered

I considered manually changing my templates, but that doesn't seem to work, because the old imports are written using the {{#imports}}...{{/imports}} variable.

If the pain of using two different Swagger versions in parallel in my project becomes too high, I will reluctantly consider turning off the automatic code generation and "manually" update.

Additional context

There is already #4245, #5388 and #4779 for the spring generator and #27 for the jaxrs-* generators.

Start with the Java generator templates and the pom.xml dependency configuration, then inspect how the {{#imports}}...{{/imports}} variable produces Swagger imports. Compare the related spring and jaxrs-* issues before deciding the affected generator scope. Done means generated projects use swagger-annotations 2.1.1 consistently without requiring parallel Swagger versions.