Fenced test_multiple_paths for sam test

Fenced test_multiple_paths to allow only specific sam entities when server runs in sam mode
The `get` method is mainly useful when providing a default value. It is more clear to perform a normal dict lookup when not providing a default value.

```python
if(conf.properties['main.project'].lower() == 'sam' and
        entitiy not in SAM_ENTITIES):
    return self.skipTest(
        ...
    )
```