Ubuntu 14.04

Warp differences between 12.04 and 14.04 in conditional when clauses.

Update test scripts to allow image to be specified as environmental variable.

To build Ubuntu 14.04 we will need to invoke the test like this:
```
export IMAGE_ID=b268bebc-290e-42ed-9e52-b3cd704a0e5d
test/setup && test/run
```