Fix FTU test

wondering if it would not be better to rename IccHelper.mSuiteSetup to IccHelper.mSetup, and same for mSuiteTeardown? The mocks helper will then take care to call these methods at the right phases (this is what attachTestHelpers does).

When I look at IccHelper.mSuiteSetup, this makes more sense to me. But maybe some other tests are relying on the fact that data are kept between tests (which is not really good for unit tests :/).