fix(karma): Add cli config poll option to karma default config

[JSMike]

With #1814 the defaults.poll property was added to angular-cli.json. This configuration setting is currently applies to ng serve but not ng test. This fix adds the poll value to the karma defaults so that if you set defaults: { poll: 1000 } it will apply to both ng serve and ng test.

[JSMike]

I still need to do some more testing, but this appears to be working as intended now. Initially I wasn't requiring in the config correctly.

[filipesilva]

@JSMike is it fully working in your scenario?

[JSMike]

@filipesilva I'm working on an example to set up the scenario and test it. I'll post tomorrow.

[JSMike]

@filipesilva Confirmed.

I tested in this env: https://github.com/JSMike/angular-cli-docker-test-env
This uses the current PR commit as the global and local angular-cli inside a docker container with a fresh project. The only modifications from a fresh project are the "poll": 1000 in angular-cli.json and setting up karma.conf.js to use a phantomjs webdriver that's hosted in a separate docker container.

When making changes to app.component.ts from the host system the docker container ran tests after a short delay.

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