UK: Provides integration test for the phone field.

#### What's this PR do?
- Provides integration test for the phone field.

#### How should this be manually tested?
- `bin/ds test uk --casperjs=uk/sso`

![image](https://cloud.githubusercontent.com/assets/672669/5271145/4740012e-7a7a-11e4-8fe1-cd46f036251e.png)
![image](https://cloud.githubusercontent.com/assets/672669/5271147/4b7dbc36-7a7a-11e4-8e5d-b125ba211531.png)