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('alpha', 300)),
    (gen_string('numeric', 300)),
    (gen_string('alphanumeric', 300)),
    (gen_string('utf8', 300)),
    (gen_string('latin1', 300)),
    (gen_string('html', 300))
)
`