Update CLI test_user

Use stubbed decorator instead of unittest.skip decorator to avoid the
need of handling the unittest import.

Wrap all factories call with a try/except block.

Update test_negative_delete_user_1 because now make_user factory does
not return the password.

Use unicode when searching for a user as the login may contain unicode
characters.
Merge pull request #1616 from elyezer/update-cli-test-user

Update CLI test_user