api_tplan_platforms, remove notes property from repr

[netzulo]

At get platforms from api_tplan_platforms, remove notes property from repr function because it's showing HTML text at python sys output

>>> platforms = tlm.api_tplan_platforms(1)                                                                                                                                                                                                                                      
2018-03-16 11:16:10,611 - qatestlink - INFO - POST request:
2018-03-16 11:16:10,703 - qatestlink - INFO - POST response:
2018-03-16 11:16:10,703 - qatestlink - INFO -     status_code=200
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "qatestlink/core/testlink_manager.py", line 250, in api_tplan_platforms
    properties = data_properties['struct']['member']
TypeError: string indices must be integers
>>> platforms = tlm.api_tplan_platforms(2)                                                                                                                                                                                                                                      
2018-03-16 11:16:49,707 - qatestlink - INFO - POST request:
2018-03-16 11:16:49,817 - qatestlink - INFO - POST response:
2018-03-16 11:16:49,817 - qatestlink - INFO -     status_code=200
>>> platforms
[TPlatform: id=1, name=DEV, notes=<p>DEVelopment environment</p>, TPlatform: id=2, name=INT, notes=<table>
        <tbody>
                <tr>
                        <td>INTegration environment</td>
                </tr>
        </tbody>
</table>]
>>> 
>>> platforms[0]
TPlatform: id=1, name=DEV, notes=<p>DEVelopment environment</p>
>>> help(platforms[0])

>>> dir(platforms[0])
['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_load', '_properties', '_properties_bool', '_properties_int', 'convert_name', 'id', 'name', 'notes']
>>>