Added positive update test for lifecycle env.

Added another positive update tests (CLI) for lifecycle environment,
this time updating the description field.

```bash
@Test: Create lifecycle environment then update its description ... ok
@Test: Create lifecycle environment then update its description ... ok
@Test: Create lifecycle environment then update its description ... ok
@Test: Create lifecycle environment then update its description ... ok
@Test: Create lifecycle environment then update its description ... ok
@Test: Create lifecycle environment then update its description ... ok
```
Merge pull request #523 from omaciel/more-lifecycle-tests

Added positive update test for lifecycle env.