Fixing entities

1) thanks for verbosity hint
2) asked sat6 devs, most of the names are char[255], meaning, that if using utf, that has wider characters, generated names needs to be much smaller, so changing to 100

Make sure to run the tests `make test-robottelo` they are not passing due this change

```python
File "/home/travis/build/omaciel/robottelo/robottelo/factory.py", line 267, in create
    json=json
```