Add ddt feature to cli OS test_positive_create
using common locators for env and ak
Add testimony expected docstrings

Also remove test data
Implement of ddt methods for OS cli

* Fix test_info test
* Implement test_negative_create test
* Implement test_positive_update test
* Implement test_negative_update test
* Implement test_positive_delete test
* Implement test_negative_delete test
Merge pull request #384 from elyezer/os-cli-ddt

Operating System cli ddt
Merge pull request #390 from sghai/fix-common-loc

using common locators for env and ak