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
You are safe to remove this message `"There should be error - hammer expects error"`.