Fixed the failing architecture tests in jenkins - update and delete

please review it
thanks

Tests covered : 
tests.foreman.cli.test_architecture.TestArchitecture.test_negative_update_1
tests.foreman.cli.test_architecture.TestArchitecture.test_positive_delete

Also, attaching the output of the results after execution
https://gist.github.com/tkolhar/40ca0c7d113e768abe44
Better formatting would be:

```python
@data(
    (gen_string("latin1", 10)),
    (gen_string("utf8", 10)),
    (gen_string("alpha", 10)),
    (gen_string("alphanumeric", 10)),
    (gen_string("numeric", 10)),
    (gen_string("html", 10))
)
```